Chris

You can but objects face to face in CGAL as long as they touch exactly after floating point considerations. What you can't do is have 3D shapes that share one...

It works if you add slices = 20. It isn't a CGAL bug. The problem is with so few slices linear_extruding a thin object causes self intersections due to the...

>if two faces have a vertex in common, they should be in the same cycle face-edge around the vertex. I think that just means faces that share a vertex should...

NetFabb Studio says the original has self intersections.  Can you post a version that is supposedly fixed? I can guarantee it isn't because CGAL is never wrong when it...

That part still has self intersections according to NetFabb:  Unfortunately the free versions can't fix them because it is hard.

Yes it seems to be some numerical instability when you rotate pentagons by the their angle and then hull them. A side of the pentagon has vertices that exactly inline...

OpenSCAD 2021.03.12.ci7606 seems to work fine on my Win7 64 bit laptop.

Change line 72 to ``` circle(r=aperture/2-ap_margin + 0.1); ``` The problem is caused by cropping the bars to a circle with exactly the same radius as the ring it is...

My understanding is OpenSCAD snaps vertices to a grid when it imports STL files. If vertices are closer than the grid spacing they merge and the topology is corrupted. So...

I have had problems with parts of an extruder that were generated by a CAD program. Not particularly small or having small features. They just happened to have some close...