ErgoMechKeyboards @lemmy.world Andy @lemmy.world 1y ago

OpenSCAD Question on bezel

I created a 2d surface that I can perform a linear extrusion on, however the result it obviously a hard edge on the extrusion. I would love to be able to add a bezel - either rounded or at 45 degrees. Is there an easy way?

5 comments

There's lots of ways to round things or chamfer things. Coming from an extruded shape, a basic chamfer is pretty easy, you can do two different extrusions, one a bit shorter than your final piece and one full height, but offset inward a bit, and then hull them together:

module shape() { square(10, center = true); } hull() { linear_extrude(8) shape(); linear_extrude(10) offset(delta = -2) shape(); }

Though, because of the hull, this will only really work with fully convex shapes. Doing this for shapes with concave features is harder.
- For rounding, you can do the extrusion, but with it a bit smaller in every dimension, then minkowski with a sphere (or a different shape if you don't want all the edges rounded), but it's tricky to get right:
  
  module shape() { square(80, center = true); } minkowski() { linear_extrude(80) shape(); sphere(r = 20); }
- Thank you. Yeah, the shape is a mix of convex and concave. I might need to just make do for this prototype.
you can also tip over a cube() by 45° and difference it from your object to take off an edge.
There were efforts trying to do make this simpler, but it was abandoned. See https://github.com/openscad/openscad/issues/4743 and related PR.