rounding edges on a strange shape
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
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Depends on what exactly you want rounded. Either rounded_prism() or
offset_sweep() can round that, treating it as a sideways object (that is an
extruded pentagon).
On Tue, May 12, 2026 at 9:49 PM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
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On Tue, 2026-05-12 at 21:48 -0400, Jon Bondy via Discuss wrote:
Any easy way to round the edges on this shape?
If I was asked to make this shape, I'd probably do it this way.
Note: I know it isn't elegant but it's the first thing that came to
mind.
//--------------
include <BOSL2/std.scad>
hull() {
#sphere(1);
down(10) #sphere(1);
right(22) #sphere(1);
down(10) right(22) #sphere(1);
down(10) back(38) #sphere(1);
down(10) right(22) back(38) #sphere(1);
back(38) up(5) #sphere(1);
back(38) up(5) right(22) #sphere(1);
back(24) up(12) right(22) #sphere(1);
back(24) up(12) #sphere(1);
}
//--------------
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
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minkowski seems to work ok?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
minkowski()
{
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
sphere (1);
}
On 13/5/26 11:48, Jon Bondy via Discuss wrote:
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
--
Cheers, Ken
bats059@gmail.com
https://vk7krj.com
https://vk7krj.com/running.html
A baby can be defined as an ego with a noise at one end and a smell at the other.
Your job as parents is to teach them to control all three.
My job as a grandad is to tell you how you are doing it all wrong!
I always start off thinking I must avoid minkowski(), but it works well
in this situation.
I had to take a medium sized project, with many difference() statements,
and refactor it into pre-difference() and post-difference() portions,
then minkowski() the union of the pre-diffs and finally apply the
post-diffs. An interesting exercise.
:)
On 5/13/2026 2:54 AM, Ken via Discuss wrote:
minkowski seems to work ok?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
minkowski()
{
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
sphere (1);
}
On 13/5/26 11:48, Jon Bondy via Discuss wrote:
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
--
Cheers, Ken
bats059@gmail.com
https://vk7krj.com
https://vk7krj.com/running.html
A baby can be defined as an ego with a noise at one end and a smell at the other.
Your job as parents is to teach them to control all three.
My job as a grandad is to tell you how you are doing it all wrong!
OpenSCAD mailing list
To unsubscribe send an email todiscuss-leave@lists.openscad.org
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I think the methods I suggested are easier. Using rounded_prism just
rounds the shape you provide, no fussing around. As I previously noted you
can also do this with offset_sweep combined with round_corners, and I
didn't think of it but also convex_offset_extrude combined with round2d().
include<BOSL2/std.scad>
side = difference([ fwd(10, square([38, 30])),
move([-10,-5], zrot(27, square(100))),
move([15,17], zrot(-27, square(100)))
])[0];
rounded_prism(side, height=22, joint_sides=5, joint_top=5, joint_bot=5);
On Wed, May 13, 2026 at 3:08 PM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
I always start off thinking I must avoid minkowski(), but it works well in
this situation.
I had to take a medium sized project, with many difference() statements,
and refactor it into pre-difference() and post-difference() portions, then
minkowski() the union of the pre-diffs and finally apply the post-diffs.
An interesting exercise.
:)
On 5/13/2026 2:54 AM, Ken via Discuss wrote:
minkowski seems to work ok?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
minkowski()
{
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
sphere (1);
}
On 13/5/26 11:48, Jon Bondy via Discuss wrote:
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
--
Cheers, Kenbats059@gmail.comhttps://vk7krj.com https://urldefense.proofpoint.com/v2/url?u=https-3A__vk7krj.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=h2RQwWIEhzj5wT2tfBV5hTt7t1xPZaMbjwOjDfl0ah2G6y4KAI3Al6kkFDzgaBso&s=nA_RFW5V5ZW2_ZH1eaUa1-g8cao0E2wOQCTIvNvbMcw&e=https://vk7krj.com/running.html https://urldefense.proofpoint.com/v2/url?u=https-3A__vk7krj.com_running.html&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=h2RQwWIEhzj5wT2tfBV5hTt7t1xPZaMbjwOjDfl0ah2G6y4KAI3Al6kkFDzgaBso&s=PAaZSXR0Y5M0oUMgy5hY_8kX1QELcQmFFNpzXBYJGms&e=
A baby can be defined as an ego with a noise at one end and a smell at the other.
Your job as parents is to teach them to control all three.
My job as a grandad is to tell you how you are doing it all wrong!
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Adrian:
As always, your code is more sophisticated than I am. I did not know
the "trick" of converting a 2D object to 3D by appending the "[0]", for
example. Your examples are always educational.
In the end, I created a complex shape (consisting of 5 connected
moderately complex shapes) and used minkowski() to smooth the entire
thing, after which I difference()'d in the various holes that needed
drilling.
Jon
On 5/13/2026 4:08 PM, Adrian Mariano via Discuss wrote:
I think the methods I suggested are easier. Using rounded_prism just
rounds the shape you provide, no fussing around. As I previously
noted you can also do this with offset_sweep combined with
round_corners, and I didn't think of it but also convex_offset_extrude
combined with round2d().
include<BOSL2/std.scad>
side = difference([ fwd(10, square([38, 30])),
move([-10,-5], zrot(27, square(100))),
move([15,17], zrot(-27, square(100)))
])[0];
rounded_prism(side, height=22, joint_sides=5, joint_top=5, joint_bot=5);
On Wed, May 13, 2026 at 3:08 PM Jon Bondy via Discuss
discuss@lists.openscad.org wrote:
I always start off thinking I must avoid minkowski(), but it works
well in this situation.
I had to take a medium sized project, with many difference()
statements, and refactor it into pre-difference() and
post-difference() portions, then minkowski() the union of the
pre-diffs and finally apply the post-diffs. An interesting exercise.
:)
On 5/13/2026 2:54 AM, Ken via Discuss wrote:
minkowski seems to work ok?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
minkowski()
{
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
sphere (1);
}
On 13/5/26 11:48, Jon Bondy via Discuss wrote:
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
--
Cheers, Ken
bats059@gmail.com
https://vk7krj.com <https://urldefense.proofpoint.com/v2/url?u=https-3A__vk7krj.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=h2RQwWIEhzj5wT2tfBV5hTt7t1xPZaMbjwOjDfl0ah2G6y4KAI3Al6kkFDzgaBso&s=nA_RFW5V5ZW2_ZH1eaUa1-g8cao0E2wOQCTIvNvbMcw&e=>
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----------------------------------------
A baby can be defined as an ego with a noise at one end and a smell at the other.
Your job as parents is to teach them to control all three.
My job as a grandad is to tell you how you are doing it all wrong!
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I am always trying to learn from the profs... ;-) But now OpenScad says
that it don´t know the function "rounded_prism"
I renewed my BOSL2 Library... but .. nope
What I am doing wrong?
KARL
Am 14.05.26 um 15:05 schrieb Jon Bondy via Discuss:
Adrian:
As always, your code is more sophisticated than I am. I did not know
the "trick" of converting a 2D object to 3D by appending the "[0]",
for example. Your examples are always educational.
In the end, I created a complex shape (consisting of 5 connected
moderately complex shapes) and used minkowski() to smooth the entire
thing, after which I difference()'d in the various holes that needed
drilling.
Jon
On 5/13/2026 4:08 PM, Adrian Mariano via Discuss wrote:
I think the methods I suggested are easier. Using rounded_prism just
rounds the shape you provide, no fussing around. As I previously
noted you can also do this with offset_sweep combined with
round_corners, and I didn't think of it but also
convex_offset_extrude combined with round2d().
include<BOSL2/std.scad>
side = difference([ fwd(10, square([38, 30])),
move([-10,-5], zrot(27, square(100))),
move([15,17], zrot(-27, square(100)))
])[0];
rounded_prism(side, height=22, joint_sides=5, joint_top=5, joint_bot=5);
On Wed, May 13, 2026 at 3:08 PM Jon Bondy via Discuss
discuss@lists.openscad.org wrote:
I always start off thinking I must avoid minkowski(), but it
works well in this situation.
I had to take a medium sized project, with many difference()
statements, and refactor it into pre-difference() and
post-difference() portions, then minkowski() the union of the
pre-diffs and finally apply the post-diffs. An interesting exercise.
:)
On 5/13/2026 2:54 AM, Ken via Discuss wrote:
minkowski seems to work ok?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
minkowski()
{
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
sphere (1);
}
On 13/5/26 11:48, Jon Bondy via Discuss wrote:
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
--
Cheers, Ken
bats059@gmail.com
https://vk7krj.com <https://urldefense.proofpoint.com/v2/url?u=https-3A__vk7krj.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=h2RQwWIEhzj5wT2tfBV5hTt7t1xPZaMbjwOjDfl0ah2G6y4KAI3Al6kkFDzgaBso&s=nA_RFW5V5ZW2_ZH1eaUa1-g8cao0E2wOQCTIvNvbMcw&e=>
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----------------------------------------
A baby can be defined as an ego with a noise at one end and a smell at the other.
Your job as parents is to teach them to control all three.
My job as a grandad is to tell you how you are doing it all wrong!
_______________________________________________
OpenSCAD mailing list
To unsubscribe send an email todiscuss-leave@lists.openscad.org
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Using a module as a function? Show your code.
Dan
On Thu, May 14, 2026 at 9:01 AM Karl Exler via Discuss <
discuss@lists.openscad.org> wrote:
I am always trying to learn from the profs... ;-) But now OpenScad says
that it don´t know the function "rounded_prism"
I renewed my BOSL2 Library... but .. nope
What I am doing wrong?
KARL
Am 14.05.26 um 15:05 schrieb Jon Bondy via Discuss:
Adrian:
As always, your code is more sophisticated than I am. I did not know the
"trick" of converting a 2D object to 3D by appending the "[0]", for
example. Your examples are always educational.
In the end, I created a complex shape (consisting of 5 connected
moderately complex shapes) and used minkowski() to smooth the entire thing,
after which I difference()'d in the various holes that needed drilling.
Jon
On 5/13/2026 4:08 PM, Adrian Mariano via Discuss wrote:
I think the methods I suggested are easier. Using rounded_prism just
rounds the shape you provide, no fussing around. As I previously noted you
can also do this with offset_sweep combined with round_corners, and I
didn't think of it but also convex_offset_extrude combined with round2d().
include<BOSL2/std.scad>
side = difference([ fwd(10, square([38, 30])),
move([-10,-5], zrot(27, square(100))),
move([15,17], zrot(-27, square(100)))
])[0];
rounded_prism(side, height=22, joint_sides=5, joint_top=5, joint_bot=5);
On Wed, May 13, 2026 at 3:08 PM Jon Bondy via Discuss <
discuss@lists.openscad.org> wrote:
I always start off thinking I must avoid minkowski(), but it works well
in this situation.
I had to take a medium sized project, with many difference() statements,
and refactor it into pre-difference() and post-difference() portions, then
minkowski() the union of the pre-diffs and finally apply the post-diffs.
An interesting exercise.
:)
On 5/13/2026 2:54 AM, Ken via Discuss wrote:
minkowski seems to work ok?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
minkowski()
{
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
sphere (1);
}
On 13/5/26 11:48, Jon Bondy via Discuss wrote:
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
--
Cheers, Kenbats059@gmail.comhttps://vk7krj.com https://urldefense.proofpoint.com/v2/url?u=https-3A__vk7krj.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=h2RQwWIEhzj5wT2tfBV5hTt7t1xPZaMbjwOjDfl0ah2G6y4KAI3Al6kkFDzgaBso&s=nA_RFW5V5ZW2_ZH1eaUa1-g8cao0E2wOQCTIvNvbMcw&e=https://vk7krj.com/running.html https://urldefense.proofpoint.com/v2/url?u=https-3A__vk7krj.com_running.html&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=h2RQwWIEhzj5wT2tfBV5hTt7t1xPZaMbjwOjDfl0ah2G6y4KAI3Al6kkFDzgaBso&s=PAaZSXR0Y5M0oUMgy5hY_8kX1QELcQmFFNpzXBYJGms&e=
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sorry for using wrong terminology... I simply tried this code.. and
received an error
include<BOSL2/std.scad>
side = difference([ fwd(10, square([38, 30])),
move([-10,-5], zrot(27, square(100))),
move([15,17], zrot(-27, square(100)))
])[0];
rounded_prism(side, height=22, joint_sides=5, joint_top=5, joint_bot=5);
Karl
Am 14.05.26 um 18:03 schrieb Dan Perry via Discuss:
Using a module as a function? Show your code.
Dan
On Thu, May 14, 2026 at 9:01 AM Karl Exler via Discuss
discuss@lists.openscad.org wrote:
I am always trying to learn from the profs... ;-) But now OpenScad
says that it don´t know the function "rounded_prism"
I renewed my BOSL2 Library... but .. nope
What I am doing wrong?
KARL
Am 14.05.26 um 15:05 schrieb Jon Bondy via Discuss:
Adrian:
As always, your code is more sophisticated than I am. I did not
know the "trick" of converting a 2D object to 3D by appending the
"[0]", for example. Your examples are always educational.
In the end, I created a complex shape (consisting of 5 connected
moderately complex shapes) and used minkowski() to smooth the
entire thing, after which I difference()'d in the various holes
that needed drilling.
Jon
On 5/13/2026 4:08 PM, Adrian Mariano via Discuss wrote:
I think the methods I suggested are easier. Using rounded_prism
just rounds the shape you provide, no fussing around. As I
previously noted you can also do this with offset_sweep combined
with round_corners, and I didn't think of it but also
convex_offset_extrude combined with round2d().
include<BOSL2/std.scad>
side = difference([ fwd(10, square([38, 30])),
move([-10,-5], zrot(27, square(100))),
move([15,17], zrot(-27, square(100)))
])[0];
rounded_prism(side, height=22, joint_sides=5, joint_top=5,
joint_bot=5);
On Wed, May 13, 2026 at 3:08 PM Jon Bondy via Discuss
<discuss@lists.openscad.org> wrote:
I always start off thinking I must avoid minkowski(), but it
works well in this situation.
I had to take a medium sized project, with many difference()
statements, and refactor it into pre-difference() and
post-difference() portions, then minkowski() the union of
the pre-diffs and finally apply the post-diffs. An
interesting exercise.
:)
On 5/13/2026 2:54 AM, Ken via Discuss wrote:
minkowski seems to work ok?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
minkowski()
{
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
sphere (1);
}
On 13/5/26 11:48, Jon Bondy via Discuss wrote:
Any easy way to round the edges on this shape?
include <BOSL2/std.scad>
eps = 0.01;
slop = 0.2;
$fa = 3;
$fs = 0.2;
inches = 25.4;
difference() {
down(10)
cube([22, 38, 30]);
// slanted top
translate([-50, -10, -5])
rotate([27, 0, 0])
cube(100);
// slanted bottom
translate([-50, 15, 17])
rotate([-27, 0, 0])
cube(100);
}
--
Cheers, Ken
bats059@gmail.com
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----------------------------------------
A baby can be defined as an ego with a noise at one end and a smell at the other.
Your job as parents is to teach them to control all three.
My job as a grandad is to tell you how you are doing it all wrong!
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