BOSL2 Rounded Cuboid Different Rounding
Is it possible with BOSL2 or something else to create a cubed with a different corner radius on the vertical edges versus the horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a 10mm corner radius (vertical) and a small radius or chamfer on the bottom and top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle, but would that be computationally expensive?
Thanks,
Mark
Easiest way to do what you want in BOSL2 is to use rounded_prism(). If you
want actual circular roundings you can do it using multiple uses of
edge_profile(), but the corner blending won't be as nice.
On Sun, Apr 19, 2026 at 1:42 PM Mark Erbaugh via Discuss <
discuss@lists.openscad.org> wrote:
Is it possible with BOSL2 or something else to create a cubed with a
different corner radius on the vertical edges versus the horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a 10mm
corner radius (vertical) and a small radius or chamfer on the bottom and
top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle, but would
that be computationally expensive?
Thanks,
Mark
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
Forgot also you can do this with offset_sweep which can give you circular
roundings with a nice blend if you want that, but might be slower.
On Sun, Apr 19, 2026 at 2:19 PM Adrian Mariano avm4@cornell.edu wrote:
Easiest way to do what you want in BOSL2 is to use rounded_prism(). If
you want actual circular roundings you can do it using multiple uses of
edge_profile(), but the corner blending won't be as nice.
On Sun, Apr 19, 2026 at 1:42 PM Mark Erbaugh via Discuss <
discuss@lists.openscad.org> wrote:
Is it possible with BOSL2 or something else to create a cubed with a
different corner radius on the vertical edges versus the horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a 10mm
corner radius (vertical) and a small radius or chamfer on the bottom and
top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle, but would
that be computationally expensive?
Thanks,
Mark
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
d= 20;
module corner(){
cylinder(d=d,h=2,center=true);
translate([0,0,1])
cylinder(d1=d,d2=0,h=d/2);
translate([0,0,-11])
cylinder(d2=d,d1=0,h=d/2);
}
module big(){
hull(){
translate([75/2,45/2,0])corner();
translate([-75/2,45/2,0])corner();
translate([75/2,-45/2,0])corner();
translate([-75/2,-45/2,0])corner();
}
}
module final(){
intersection(){
big();
cube([100,100,3],center=true);
}
}
final();
On 19/04/2026 18:41, Mark Erbaugh via Discuss wrote:
Is it possible with BOSL2 or something else to create a cubed with a different corner radius on the vertical edges versus the horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a 10mm corner radius (vertical) and a small radius or chamfer on the bottom and top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle, but would that be computationally expensive?
Thanks,
Mark
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
Thanks for all the replies.
I came up with the hull() approach shortly after my post.
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
}
On Apr 19, 2026, at 3:11 PM, Raymond West via Discuss discuss@lists.openscad.org wrote:
d= 20;
module corner(){
cylinder(d=d,h=2,center=true);
translate([0,0,1])
cylinder(d1=d,d2=0,h=d/2);
translate([0,0,-11])
cylinder(d2=d,d1=0,h=d/2);
}
module big(){
hull(){
translate([75/2,45/2,0])corner();
translate([-75/2,45/2,0])corner();
translate([75/2,-45/2,0])corner();
translate([-75/2,-45/2,0])corner();
}
}
module final(){
intersection(){
big();
cube([100,100,3],center=true);
}
}
final();
On 19/04/2026 18:41, Mark Erbaugh via Discuss wrote:
Is it possible with BOSL2 or something else to create a cubed with a different corner radius on the vertical edges versus the horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a 10mm corner radius (vertical) and a small radius or chamfer on the bottom and top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle, but would that be computationally expensive?
Thanks,
Mark
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
Yet another way to do this.
module mybase(x,y,z,rv,rh) {
convex_offset_extrude(top=os_circle(rh), bottom=os_circle(rh), height=z)
rect([x,y], rounding=rv);
}
This also allows specifying a different radius or chamfer for each corner
of the rect() and more choices of treatments for the top and bottom. Also
it is possible implement convex_offset_extrude() using roof() instead of
hull() and have offset_extrude() for non convex stuff such as text.
On Sun, Apr 19, 2026 at 4:39 PM Mark Erbaugh via Discuss <
discuss@lists.openscad.org> wrote:
Thanks for all the replies.
I came up with the hull() approach shortly after my post.
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
}
On Apr 19, 2026, at 3:11 PM, Raymond West via Discuss <
discuss@lists.openscad.org> wrote:
d= 20;
module corner(){
cylinder(d=d,h=2,center=true);
translate([0,0,1])
cylinder(d1=d,d2=0,h=d/2);
translate([0,0,-11])
cylinder(d2=d,d1=0,h=d/2);
}
module big(){
hull(){
translate([75/2,45/2,0])corner();
translate([-75/2,45/2,0])corner();
translate([75/2,-45/2,0])corner();
translate([-75/2,-45/2,0])corner();
}
}
module final(){
intersection(){
big();
cube([100,100,3],center=true);
}
}
final();
On 19/04/2026 18:41, Mark Erbaugh via Discuss wrote:
Is it possible with BOSL2 or something else to create a cubed with a
different corner radius on the vertical edges versus the horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a 10mm
corner radius (vertical) and a small radius or chamfer on the bottom and
top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle, but
would that be computationally expensive?
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
The code compiles, but I've never heard of "convex_offset_extrude" and
it's not in the Cheat Sheet.
Jon
On 4/19/2026 7:29 PM, Todd Allen via Discuss wrote:
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
Yet another way to do this.
module mybase(x,y,z,rv,rh) {
convex_offset_extrude(top=os_circle(rh), bottom=os_circle(rh),
height=z)
rect([x,y], rounding=rv);
}
This also allows specifying a different radius or chamfer for each
corner of the rect() and more choices of treatments for the top and
bottom. Also it is possible implement convex_offset_extrude() using
roof() instead of hull() and have offset_extrude() for non convex
stuff such as text.
On Sun, Apr 19, 2026 at 4:39 PM Mark Erbaugh via Discuss
discuss@lists.openscad.org wrote:
Thanks for all the replies.
I came up with the hull() approach shortly after my post.
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
}
On Apr 19, 2026, at 3:11 PM, Raymond West via Discuss
<discuss@lists.openscad.org> wrote:
d= 20;
module corner(){
cylinder(d=d,h=2,center=true);
translate([0,0,1])
cylinder(d1=d,d2=0,h=d/2);
translate([0,0,-11])
cylinder(d2=d,d1=0,h=d/2);
}
module big(){
hull(){
translate([75/2,45/2,0])corner();
translate([-75/2,45/2,0])corner();
translate([75/2,-45/2,0])corner();
translate([-75/2,-45/2,0])corner();
}
}
module final(){
intersection(){
big();
cube([100,100,3],center=true);
}
}
final();
On 19/04/2026 18:41, Mark Erbaugh via Discuss wrote:
Is it possible with BOSL2 or something else to create a cubed
with a different corner radius on the vertical edges versus the
horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a
10mm corner radius (vertical) and a small radius or chamfer on the
bottom and top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle,
but would that be computationally expensive?
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
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convex_offset_extrude() is a BOSL2 module.
On Sun, Apr 19, 2026, 7:32 PM Jon Bondy jon@jonbondy.com wrote:
The code compiles, but I've never heard of "convex_offset_extrude" and
it's not in the Cheat Sheet.
Jon
On 4/19/2026 7:29 PM, Todd Allen via Discuss wrote:
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
Yet another way to do this.
module mybase(x,y,z,rv,rh) {
convex_offset_extrude(top=os_circle(rh), bottom=os_circle(rh),
height=z)
rect([x,y], rounding=rv);
}
This also allows specifying a different radius or chamfer for each corner
of the rect() and more choices of treatments for the top and bottom. Also
it is possible implement convex_offset_extrude() using roof() instead of
hull() and have offset_extrude() for non convex stuff such as text.
On Sun, Apr 19, 2026 at 4:39 PM Mark Erbaugh via Discuss <
discuss@lists.openscad.org> wrote:
Thanks for all the replies.
I came up with the hull() approach shortly after my post.
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
}
On Apr 19, 2026, at 3:11 PM, Raymond West via Discuss <
discuss@lists.openscad.org> wrote:
d= 20;
module corner(){
cylinder(d=d,h=2,center=true);
translate([0,0,1])
cylinder(d1=d,d2=0,h=d/2);
translate([0,0,-11])
cylinder(d2=d,d1=0,h=d/2);
}
module big(){
hull(){
translate([75/2,45/2,0])corner();
translate([-75/2,45/2,0])corner();
translate([75/2,-45/2,0])corner();
translate([-75/2,-45/2,0])corner();
}
}
module final(){
intersection(){
big();
cube([100,100,3],center=true);
}
}
final();
On 19/04/2026 18:41, Mark Erbaugh via Discuss wrote:
Is it possible with BOSL2 or something else to create a cubed with a
different corner radius on the vertical edges versus the horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a 10mm
corner radius (vertical) and a small radius or chamfer on the bottom and
top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle, but
would that be computationally expensive?
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
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To unsubscribe send an email to discuss-leave@lists.openscad.orga
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Interesting.
Your code, as shown, without an invocation of base(), survived an F5 without comment, implying to me that convex_offset_extrude() was "OK", known. I guess that is not the case, since I did not use BOSL2.
Thanks
On 4/19/2026 9:10 PM, Todd Allen wrote:
convex_offset_extrude() is a BOSL2 module.
On Sun, Apr 19, 2026, 7:32 PM Jon Bondy <jon@jonbondy.commailto:jon@jonbondy.com> wrote:
The code compiles, but I've never heard of "convex_offset_extrude" and it's not in the Cheat Sheet.
Jon
On 4/19/2026 7:29 PM, Todd Allen via Discuss wrote:
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
Yet another way to do this.
module mybase(x,y,z,rv,rh) {
convex_offset_extrude(top=os_circle(rh), bottom=os_circle(rh), height=z)
rect([x,y], rounding=rv);
}
This also allows specifying a different radius or chamfer for each corner of the rect() and more choices of treatments for the top and bottom. Also it is possible implement convex_offset_extrude() using roof() instead of hull() and have offset_extrude() for non convex stuff such as text.
On Sun, Apr 19, 2026 at 4:39 PM Mark Erbaugh via Discuss <discuss@lists.openscad.orgmailto:discuss@lists.openscad.org> wrote:
Thanks for all the replies.
I came up with the hull() approach shortly after my post.
module base(x,y,z,rv,rh)
{
hull()
for (ix=[-1,1], iy=[-1,1])
translate(0.5 * [ix * (x - 2 * rv), iy * (y - 2 * rv)])
cyl(r=rv,h=z,rounding=rh, anchor=BOT);
}
On Apr 19, 2026, at 3:11 PM, Raymond West via Discuss <discuss@lists.openscad.orgmailto:discuss@lists.openscad.org> wrote:
d= 20;
module corner(){
cylinder(d=d,h=2,center=true);
translate([0,0,1])
cylinder(d1=d,d2=0,h=d/2);
translate([0,0,-11])
cylinder(d2=d,d1=0,h=d/2);
}
module big(){
hull(){
translate([75/2,45/2,0])corner();
translate([-75/2,45/2,0])corner();
translate([75/2,-45/2,0])corner();
translate([-75/2,-45/2,0])corner();
}
}
module final(){
intersection(){
big();
cube([100,100,3],center=true);
}
}
final();
On 19/04/2026 18:41, Mark Erbaugh via Discuss wrote:
Is it possible with BOSL2 or something else to create a cubed with a different corner radius on the vertical edges versus the horizontal edges?
For example, I want to create a cuboid [85,55,3] (x,y,z) with a 10mm corner radius (vertical) and a small radius or chamfer on the bottom and top faces.
I suppose I could do a Minkowski using a rounded 2d rectangle, but would that be computationally expensive?
Thanks,
Mark
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.orgmailto:discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.orgmailto:discuss-leave@lists.openscad.org
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On 4/19/2026 10:41 AM, Mark Erbaugh via Discuss wrote:
Is it possible with BOSL2 or something else to create a cubed with a different corner radius on the vertical edges versus the horizontal edges?
I expect that BOSL2 has something better and easier, but in bare
OpenSCAD I found that what I needed was to do a hull of eight toruses.
The major radius controls the rounding in one axis; the minor radius
controls the rounding in the other two.
Right now it is hurting my brain trying to figure out what it means if
the minor radius is larger than the major radius. Visualizing, I don't
see a problem with it, but I'm pretty sure the geometry falls apart and
that suggests that there is a problem.