On 06.04.2021 21:52, Ray West wrote: > In the past, I've managed to get around the things i want to round the > corners, ether by differencing a sort of Maltese cross shape for simple > square edges, or importing the scad file into freecad and re-exporting > it, sometimes it works, but not if a minkowski is used in the scad file. > I fond this fillet library - https://www.thingiverse.com/thing:2461392 > but it takes 10minutes and 22secs just to do the quick view of the demo > files, and a further 31minutes 36seconds to render for the stl. I pasted > the original scad code  into the  AngelCad text editor, saved it as an > scad, and then it only took 9.285 seconds to get to the stl. That is a > pretty big improvement in speed., makes things usable. I still need to > see if the filleting does what I want. I downloaded/saved fillet2d.scad and fillet3d.scad in the same folder, then ran fillet3d.scad in OpenSCAD and AngelCAD. Times for getting the STL on my computer (Kubuntu 18.04, 32GB RAM) OpenSCAD: 16m 35s version 2021.04.05.nightly (git 9f01067) AngelCAD: 1m 10s version v1.5-06 (secant_tolerance=0.01) STL File sizes: OpenSCAD: 8.1 MB AngelCAD: 5.1 MB The difference in size is due to different discretization of the result. Carsten Arnholm