Complex rounding issue
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has
suggestions on how to approach this. I've always found rounding and
chamfering to be very tedious using plain OpenSCAD until I found how to do
it with BOSL2, which has been a godsend for the cases I've encountered so
far. But today I have the shape in the picture below, for which the code is
at the bottom. I'm looking to round out all surfaces of the 'fins' that
radiate out from the center 'stem' come in contact with other surfaces.
(this is a presser tool for stuffing food into a mold, the 'fins' are to
distribute the pressure that is manually exerted on the ring to the bottom
platelet).
I've marked the various lines that need to be rounded out in different
colors. Out of these, the turquoise one I could do with a BOSL2
rounding_edge_mask(), and the green one too if I use an appropriate 'ang'
parameter (which I can calculate fairly easily). However I have no idea how
to do the red one or the orange one, nor how to let e.g. the orange one
blend smoothly into the green one for example; and the same for all the
other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
[image: presser_foot_rounding.png]
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from
overlapping.
// It has a separate name so that you know where it's used
what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1, edges="X",
anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height],
rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2],
rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play,
g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding =
g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size,
rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also cut
into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3,
rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size * 2],
anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
Roel:
The "fins" appear to be parts of cubes, which BOSL2 rounds easily.
Create a rounded cube and then translate() and rotate() it into
position, with some of the cube extending below the bottom surface.
Then clean up the bottom with a difference().
On 8/23/2024 6:48 AM, Roel Vanhout via Discuss wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone
has suggestions on how to approach this. I've always found rounding
and chamfering to be very tedious using plain OpenSCAD until I found
how to do it with BOSL2, which has been a godsend for the cases I've
encountered so far. But today I have the shape in the picture below,
for which the code is at the bottom. I'm looking to round out all
surfaces of the 'fins' that radiate out from the center 'stem' come in
contact with other surfaces. (this is a presser tool for stuffing food
into a mold, the 'fins' are to distribute the pressure that is
manually exerted on the ring to the bottom platelet).
I've marked the various lines that need to be rounded out in different
colors. Out of these, the turquoise one I could do with a BOSL2
rounding_edge_mask(), and the green one too if I use an appropriate
'ang' parameter (which I can calculate fairly easily). However I have
no idea how to do the red one or the orange one, nor how to let e.g.
the orange one blend smoothly into the green one for example; and the
same for all the other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
presser_foot_rounding.png
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes
from overlapping.
// It has a separate name so that you know where it's
used what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1,
edges="X", anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height],
rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2],
rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play,
g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4,
rounding = g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size,
rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will
also cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3,
rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size
- 2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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I've done something similar using BOSL2 rounded_prism(), but I don't have
any idea how to handle the red fillet, or even the orange vertical fillet.
The solution becomes almost trivial if that center cylinder could be
6-sided or 8-sided.
Dan
On Fri, Aug 23, 2024 at 11:48 AM Roel Vanhout via Discuss <
discuss@lists.openscad.org> wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has
suggestions on how to approach this. I've always found rounding and
chamfering to be very tedious using plain OpenSCAD until I found how to do
it with BOSL2, which has been a godsend for the cases I've encountered so
far. But today I have the shape in the picture below, for which the code is
at the bottom. I'm looking to round out all surfaces of the 'fins' that
radiate out from the center 'stem' come in contact with other surfaces.
(this is a presser tool for stuffing food into a mold, the 'fins' are to
distribute the pressure that is manually exerted on the ring to the bottom
platelet).
I've marked the various lines that need to be rounded out in different
colors. Out of these, the turquoise one I could do with a BOSL2
rounding_edge_mask(), and the green one too if I use an appropriate 'ang'
parameter (which I can calculate fairly easily). However I have no idea how
to do the red one or the orange one, nor how to let e.g. the orange one
blend smoothly into the green one for example; and the same for all the
other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
[image: presser_foot_rounding.png]
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from
overlapping.
// It has a separate name so that you know where it's used
what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1, edges="X",
anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height],
rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2],
rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play,
g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding =
g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size,
rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also
cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3,
rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size *
2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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You might want to look at join_prism. It looks tricky to use but I think you should be able to make this work for you looking at the description. But quite complex.
On 23 Aug 2024, at 12:48, Roel Vanhout via Discuss discuss@lists.openscad.org wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has suggestions on how to approach this. I've always found rounding and chamfering to be very tedious using plain OpenSCAD until I found how to do it with BOSL2, which has been a godsend for the cases I've encountered so far. But today I have the shape in the picture below, for which the code is at the bottom. I'm looking to round out all surfaces of the 'fins' that radiate out from the center 'stem' come in contact with other surfaces. (this is a presser tool for stuffing food into a mold, the 'fins' are to distribute the pressure that is manually exerted on the ring to the bottom platelet).
I've marked the various lines that need to be rounded out in different colors. Out of these, the turquoise one I could do with a BOSL2 rounding_edge_mask(), and the green one too if I use an appropriate 'ang' parameter (which I can calculate fairly easily). However I have no idea how to do the red one or the orange one, nor how to let e.g. the orange one blend smoothly into the green one for example; and the same for all the other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
<presser_foot_rounding.png>
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from overlapping.
// It has a separate name so that you know where it's used what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1, edges="X", anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height], rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2], rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play, g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding = g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size, rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3, rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size * 2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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This and other far more complex fillets can be created using python codes
integrated with openscad.
But then some elementary understanding of python is required.
In pure openscad this could be very challenging.
On Fri, 23 Aug, 2024, 4:19 pm Roel Vanhout via Discuss, <
discuss@lists.openscad.org> wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has
suggestions on how to approach this. I've always found rounding and
chamfering to be very tedious using plain OpenSCAD until I found how to do
it with BOSL2, which has been a godsend for the cases I've encountered so
far. But today I have the shape in the picture below, for which the code is
at the bottom. I'm looking to round out all surfaces of the 'fins' that
radiate out from the center 'stem' come in contact with other surfaces.
(this is a presser tool for stuffing food into a mold, the 'fins' are to
distribute the pressure that is manually exerted on the ring to the bottom
platelet).
I've marked the various lines that need to be rounded out in different
colors. Out of these, the turquoise one I could do with a BOSL2
rounding_edge_mask(), and the green one too if I use an appropriate 'ang'
parameter (which I can calculate fairly easily). However I have no idea how
to do the red one or the orange one, nor how to let e.g. the orange one
blend smoothly into the green one for example; and the same for all the
other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
[image: presser_foot_rounding.png]
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from
overlapping.
// It has a separate name so that you know where it's used
what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1, edges="X",
anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height],
rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2],
rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play,
g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding =
g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size,
rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also
cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3,
rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size *
2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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I gave it a try
[image: Screenshot 2024-08-24 at 9.16.07 AM.png]
On Fri, 23 Aug 2024 at 16:19, Roel Vanhout via Discuss <
discuss@lists.openscad.org> wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has
suggestions on how to approach this. I've always found rounding and
chamfering to be very tedious using plain OpenSCAD until I found how to do
it with BOSL2, which has been a godsend for the cases I've encountered so
far. But today I have the shape in the picture below, for which the code is
at the bottom. I'm looking to round out all surfaces of the 'fins' that
radiate out from the center 'stem' come in contact with other surfaces.
(this is a presser tool for stuffing food into a mold, the 'fins' are to
distribute the pressure that is manually exerted on the ring to the bottom
platelet).
I've marked the various lines that need to be rounded out in different
colors. Out of these, the turquoise one I could do with a BOSL2
rounding_edge_mask(), and the green one too if I use an appropriate 'ang'
parameter (which I can calculate fairly easily). However I have no idea how
to do the red one or the orange one, nor how to let e.g. the orange one
blend smoothly into the green one for example; and the same for all the
other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
[image: presser_foot_rounding.png]
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from
overlapping.
// It has a separate name so that you know where it's used
what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1, edges="X",
anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height],
rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2],
rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play,
g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding =
g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size,
rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also
cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3,
rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size *
2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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Thank you for that, join_prism() is an amazing module, which has gotten me
to the first image below using the code below that image. Although I can
make it 'good enough' by increasing the rounding at the base of the
cylinder and setting 'debug = true' to allow self-intersection in the
join_prism(), I'm wondering if there's a clean solution for the gap at the
bottom? The problem stems from the rounding not being able to handle
'flowing' into each other. See the last image below, which is with debug
set to 'true' to allow self-intersection - this is with the cylinder and
base plate hidden so that you can clearly see the corner at the bottom. As
I said, I can sort of manage to get all roundings to just intersect each
other and then I'm left with a sort of hard, inward corner where they all
join, but I'm wondering if I'm missing something from the myriad of
join_prism() options.
[image: image.png]
module join_prism_test() {
cuboid([100, 100, 5], anchor=CENTER+BOTTOM+FRONT);
up(5) back(10)
zcyl(l = 50, d = 20, , $fn=128, rounding1 = -2,
anchor=CENTER+BOTTOM);
polygon_ = rect([4, 26.4], rounding = 2);
base_T = back(0);
aux_T = up(35) * fwd(30) * yrot(90);
up(5) back(40)
join_prism(polygon_,
"plane", // 'base'
base_T = base_T,
aux = "cylinder",
aux_d = 20,
aux_T = aux_T,
fillet = 2,
//debug = true
);
}
[image: image.png]
On Fri, Aug 23, 2024 at 2:02 PM Peter Kriens peter.kriens@aqute.biz wrote:
You might want to look at join_prism. It looks tricky to use but I think
you should be able to make this work for you looking at the description.
But quite complex.
On 23 Aug 2024, at 12:48, Roel Vanhout via Discuss <
discuss@lists.openscad.org> wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has
suggestions on how to approach this. I've always found rounding and
chamfering to be very tedious using plain OpenSCAD until I found how to do
it with BOSL2, which has been a godsend for the cases I've encountered so
far. But today I have the shape in the picture below, for which the code is
at the bottom. I'm looking to round out all surfaces of the 'fins' that
radiate out from the center 'stem' come in contact with other surfaces.
(this is a presser tool for stuffing food into a mold, the 'fins' are to
distribute the pressure that is manually exerted on the ring to the bottom
platelet).
I've marked the various lines that need to be rounded out in different
colors. Out of these, the turquoise one I could do with a BOSL2
rounding_edge_mask(), and the green one too if I use an appropriate 'ang'
parameter (which I can calculate fairly easily). However I have no idea how
to do the red one or the orange one, nor how to let e.g. the orange one
blend smoothly into the green one for example; and the same for all the
other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
<presser_foot_rounding.png>
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from
overlapping.
// It has a separate name so that you know where it's
used what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1,
edges="X", anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height],
rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2],
rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play,
g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding
= g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size,
rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also
cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3,
rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size *
2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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This is amazing, would you mind sharing the code that created this? I
write Python every day and I'm much more comfortable with it than with
straight OpenSCAD, but I always thought that using Python to generate
OpenSCAD code was mostly syntactic sugar like having 'real' for loops with
updating variables and such, I didn't know (and still don't quite see how
tbh) that it also allowed for such complex shapes.
cheers
On Sat, Aug 24, 2024 at 5:49 AM Sanjeev Prabhakar sprabhakar2006@gmail.com
wrote:
I gave it a try
[image: Screenshot 2024-08-24 at 9.16.07 AM.png]
On Fri, 23 Aug 2024 at 16:19, Roel Vanhout via Discuss <
discuss@lists.openscad.org> wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has
suggestions on how to approach this. I've always found rounding and
chamfering to be very tedious using plain OpenSCAD until I found how to do
it with BOSL2, which has been a godsend for the cases I've encountered so
far. But today I have the shape in the picture below, for which the code is
at the bottom. I'm looking to round out all surfaces of the 'fins' that
radiate out from the center 'stem' come in contact with other surfaces.
(this is a presser tool for stuffing food into a mold, the 'fins' are to
distribute the pressure that is manually exerted on the ring to the bottom
platelet).
I've marked the various lines that need to be rounded out in different
colors. Out of these, the turquoise one I could do with a BOSL2
rounding_edge_mask(), and the green one too if I use an appropriate 'ang'
parameter (which I can calculate fairly easily). However I have no idea how
to do the red one or the orange one, nor how to let e.g. the orange one
blend smoothly into the green one for example; and the same for all the
other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
[image: presser_foot_rounding.png]
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from
overlapping.
// It has a separate name so that you know where it's used
what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1,
edges="X", anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height],
rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2],
rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play,
g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding
= g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size,
rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also
cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3,
rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size *
2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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Its one of the many functions in BOSL2 that so far scared me too much to use ... :-)
But it looks promising ...
On 24 Aug 2024, at 17:35, Roel Vanhout roel.vanhout@gmail.com wrote:
Thank you for that, join_prism() is an amazing module, which has gotten me to the first image below using the code below that image. Although I can make it 'good enough' by increasing the rounding at the base of the cylinder and setting 'debug = true' to allow self-intersection in the join_prism(), I'm wondering if there's a clean solution for the gap at the bottom? The problem stems from the rounding not being able to handle 'flowing' into each other. See the last image below, which is with debug set to 'true' to allow self-intersection - this is with the cylinder and base plate hidden so that you can clearly see the corner at the bottom. As I said, I can sort of manage to get all roundings to just intersect each other and then I'm left with a sort of hard, inward corner where they all join, but I'm wondering if I'm missing something from the myriad of join_prism() options.
<image.png>
module join_prism_test() {
cuboid([100, 100, 5], anchor=CENTER+BOTTOM+FRONT);
up(5) back(10)
zcyl(l = 50, d = 20, , $fn=128, rounding1 = -2, anchor=CENTER+BOTTOM);
polygon_ = rect([4, 26.4], rounding = 2);
base_T = back(0);
aux_T = up(35) * fwd(30) * yrot(90);
up(5) back(40)
join_prism(polygon_,
"plane", // 'base'
base_T = base_T,
aux = "cylinder",
aux_d = 20,
aux_T = aux_T,
fillet = 2,
//debug = true
);
}
<image.png>
On Fri, Aug 23, 2024 at 2:02 PM Peter Kriens <peter.kriens@aqute.biz mailto:peter.kriens@aqute.biz> wrote:
You might want to look at join_prism. It looks tricky to use but I think you should be able to make this work for you looking at the description. But quite complex.
On 23 Aug 2024, at 12:48, Roel Vanhout via Discuss <discuss@lists.openscad.org mailto:discuss@lists.openscad.org> wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has suggestions on how to approach this. I've always found rounding and chamfering to be very tedious using plain OpenSCAD until I found how to do it with BOSL2, which has been a godsend for the cases I've encountered so far. But today I have the shape in the picture below, for which the code is at the bottom. I'm looking to round out all surfaces of the 'fins' that radiate out from the center 'stem' come in contact with other surfaces. (this is a presser tool for stuffing food into a mold, the 'fins' are to distribute the pressure that is manually exerted on the ring to the bottom platelet).
I've marked the various lines that need to be rounded out in different colors. Out of these, the turquoise one I could do with a BOSL2 rounding_edge_mask(), and the green one too if I use an appropriate 'ang' parameter (which I can calculate fairly easily). However I have no idea how to do the red one or the orange one, nor how to let e.g. the orange one blend smoothly into the green one for example; and the same for all the other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
<presser_foot_rounding.png>
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from overlapping.
// It has a separate name so that you know where it's used what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1, edges="X", anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height], rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2], rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play, g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding = g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size, rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3, rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size * 2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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I believe that the approach Sanjeev uses is not to use python to generate
openscad code but to use python to generate the entire object as a
polyhedron and then just pass that to openscad to be rendered. You can of
course produce any object this way if you work hard enough on your python
code.
I don't see a way that you can fill the little gap with join_prism(). If
you allow self-intersection you won't be able to create an STL. Does that
matter to you?
A lot of the limitations in the join_prism() implementation result from the
need to have an interface to the module. I made it as general as I could
figure out how to make it, but it can't do everything. And as noted by
others, it's already not the most accessible interface.
I think if I were designing this model I would probably try to rethink it
so that it was easier to round. For example using the octagon idea one
person proposed so that the supports meet a plane. Or making the supports
meet in the middle with a concave rounding instead of transitioning to the
convex circular rounding, which is responsible for much of the challenge.
So something along these lines as the starting idea:
path = [[1,1],[7,1],[7,-1]];
fourpath = [for(ang=[0:90:359]) each zrot(-ang,path)];
roundpath = round_corners(fourpath, r=flatten(repeat([1.5,1,1],4)));
offset_sweep(roundpath, h=5, bottom=os_circle(r=-1), top=os_circle(r=1));
You'd need to cut it to make wedges and round their top edges. Having the
wedge shapes not taper all the way to nothing would also make the task
easier.
[image: image.png]
On Sat, Aug 24, 2024 at 11:39 AM Roel Vanhout via Discuss <
discuss@lists.openscad.org> wrote:
This is amazing, would you mind sharing the code that created this? I
write Python every day and I'm much more comfortable with it than with
straight OpenSCAD, but I always thought that using Python to generate
OpenSCAD code was mostly syntactic sugar like having 'real' for loops with
updating variables and such, I didn't know (and still don't quite see how
tbh) that it also allowed for such complex shapes.
cheers
On Sat, Aug 24, 2024 at 5:49 AM Sanjeev Prabhakar <
sprabhakar2006@gmail.com> wrote:
I gave it a try
[image: Screenshot 2024-08-24 at 9.16.07 AM.png]
On Fri, 23 Aug 2024 at 16:19, Roel Vanhout via Discuss <
discuss@lists.openscad.org> wrote:
Hello all,
I have a complex shape to round for which I'd like to ask if anyone has
suggestions on how to approach this. I've always found rounding and
chamfering to be very tedious using plain OpenSCAD until I found how to do
it with BOSL2, which has been a godsend for the cases I've encountered so
far. But today I have the shape in the picture below, for which the code is
at the bottom. I'm looking to round out all surfaces of the 'fins' that
radiate out from the center 'stem' come in contact with other surfaces.
(this is a presser tool for stuffing food into a mold, the 'fins' are to
distribute the pressure that is manually exerted on the ring to the bottom
platelet).
I've marked the various lines that need to be rounded out in different
colors. Out of these, the turquoise one I could do with a BOSL2
rounding_edge_mask(), and the green one too if I use an appropriate 'ang'
parameter (which I can calculate fairly easily). However I have no idea how
to do the red one or the orange one, nor how to let e.g. the orange one
blend smoothly into the green one for example; and the same for all the
other places where roundovers meet.
Any ideas on how I can do this? Thank you.
regards
Roel
[image: presser_foot_rounding.png]
include <BOSL2-master/std.scad>
include <BOSL2-master/screws.scad>
include <BOSL2-master/threading.scad>
ZFE = 0.01; // Z fighting epsilon, a constant to prevent planes from
overlapping.
// It has a separate name so that you know where it's
used what it's for.
ZFE_2 = ZFE * 2;
ZFE_3 = ZFE * 3;
$fn = $preview ? 64 : 128;
// Global
g_corner_rounding = 2;
// Ring
g_wall_thickness = 3;
g_inside_size = 90;
g_height = 70;
// Lid
g_lid_play = 1;
g_presser_height = 30;
g_presser_width = 20;
g_lid_rounding = 5;
g_presser_size = 10;
module ring() {
outside_size = g_inside_size + (2 * g_wall_thickness);
//cuboid([g_wall_thickness, depth, clip_height], chamfer=1,
edges="X", anchor=LEFT+BOTTOM+FRONT);
difference() {
cuboid([outside_size, outside_size, g_height],
rounding=g_corner_rounding, edges="Z");
cuboid([g_inside_size, g_inside_size, g_height + ZFE_2],
rounding=g_corner_rounding, edges="Z");
}
}
module presser() {
cuboid([g_inside_size - g_lid_play, g_inside_size - g_lid_play,
g_wall_thickness * 2], rounding=g_corner_rounding, edges="Z");
difference() {
union() {
// The outer cylinder that will make the presser handle ring
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width, d=g_presser_size * 4, rounding
= g_corner_rounding);
// The 'stem' of the presser handle
up(g_wall_thickness + g_presser_height / 2)
zcyl(l = g_presser_height, r=g_presser_size,
rounding1=-g_lid_rounding);
}
// Cut away the inside of the presser handle ring. It will also
cut into the top of the stem a bit, hence why
// it's here.
up(g_wall_thickness + g_presser_height * 1.5)
ycyl(l = g_presser_width + ZFE_2, d=g_presser_size * 3,
rounding = -g_corner_rounding);
}
//up(g_wall_thickness)
for (r = [45 : 90 : 360]) {
zrot(r) up(g_wall_thickness)
wedge([g_presser_size, g_presser_size * 5, g_presser_size *
2], anchor=CENTER+BOTTOM+FRONT);
}
}
ring();
right(150) presser();
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