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
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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Works fine here, using a recent snapshot of OpenSCAD and BOSL2
On 5/14/2026 12:48 PM, Karl Exler via Discuss wrote:
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);
--
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Your code worked for me. Seems like OpenSCAD doesn't know the location of
your BOSL2 library.
Dan
On Thu, May 14, 2026 at 9:48 AM Karl Exler via Discuss <
discuss@lists.openscad.org> wrote:
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, 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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On 5/14/2026 6:05 AM, Jon Bondy via Discuss wrote:
I did not know the "trick" of converting a 2D object to 3D by
appending the "[0]", for example.
There's no trick, and the [0] doesn't convert a 2D object to 3D.
BOSL2's difference() function returns a list of lists of points. It's a
list of lists because the result of a difference can be more than one
polygon.
Adding the [0] does what it always does: it yields the first element in
the list - in this case, the one and only list of points in the result.
That list of points is converted into a 3D object by rounded_prism,
because that's what rounded_prism does: construct a polyhedron from one
or two lists of points, rounding the edges.
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 5/14/2026 9:48 AM, Karl Exler via Discuss wrote:
sorry for using wrong terminology... I simply tried this code.. and
received an error
And the error that you got was...?
(Make sure to include all errors, not just the last one.)
Ah. So BOSL2 has a difference() and OpenSCAD has a difference() and
there is no way to know which one you are using at any one time?
I know that this kind of overloading is popular, and that I am in the
minority, and that it is too late, but I really dislike this situation.
On 5/14/2026 1:22 PM, Jordan Brown wrote:
On 5/14/2026 6:05 AM, Jon Bondy via Discuss wrote:
I did not know the "trick" of converting a 2D object to 3D by
appending the "[0]", for example.
There's no trick, and the [0] doesn't convert a 2D object to 3D.
BOSL2's difference() function returns a list of lists of points. It's
a list of lists because the result of a difference can be more than
one polygon.
Adding the [0] does what it always does: it yields the first element
in the list - in this case, the one and only list of points in the result.
That list of points is converted into a 3D object by rounded_prism,
because that's what rounded_prism does: construct a polyhedron from
one or two lists of points, rounding the edges.
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);
Well, not exactly. OpenSCAD has a difference MODULE. And BOSL2 has a
difference FUNCTION. You always know which one you are using because if
you are using a module it's the native OpenSCAD difference() and if you're
using a function it's the BOSL2 function. Assuming that you understand the
difference between functions and modules, the situation should be clear.
We made the decision to do things this way because it seemed to us to be
very clean and natural, especially since in many cases the module and
function form take exactly the same arguments and then do the same
thing---just the function returns a point list and the module returns
geometry. Almost every module in BOSL2 has a matching function form. It
seemed like tremendous clutter would be created (as well as increased
complication in the docs) if the function forms all had different names
than the module forms.
On Thu, May 14, 2026 at 5:53 PM jon jonbondy.com via Discuss <
discuss@lists.openscad.org> wrote:
Ah. So BOSL2 has a difference() and OpenSCAD has a difference() and
there is no way to know which one you are using at any one time?
I know that this kind of overloading is popular, and that I am in the
minority, and that it is too late, but I really dislike this situation.
On 5/14/2026 1:22 PM, Jordan Brown wrote:
On 5/14/2026 6:05 AM, Jon Bondy via Discuss wrote:
I did not know the "trick" of converting a 2D object to 3D by
appending the "[0]", for example.
There's no trick, and the [0] doesn't convert a 2D object to 3D.
BOSL2's difference() function returns a list of lists of points. It's
a list of lists because the result of a difference can be more than
one polygon.
Adding the [0] does what it always does: it yields the first element
in the list - in this case, the one and only list of points in the
result.
That list of points is converted into a 3D object by rounded_prism,
because that's what rounded_prism does: construct a polyhedron from
one or two lists of points, rounding the edges.
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);
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