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I am not sure if I never mentioned on this forum what a kruhotvar is, but it is a very specific type of circular repetition of something simple. They have originally been 2D objects that have always started as a very simple shape drawn in Affinity Designer, exported to SVG, and then hand-processed by yours truly. This week I have been toying with the idea of converting them into 3D objects (because I have ordered a Prusa 3D printer and it is expected to ship this coming week, not my first 3D printer but should be the first one that actually works unlike the Ender-5 junk that I have had for a few years). I wrote a routine that writes a script for OpenSCAD to convert the above-mentioned simple shape to a 3D object. It can do it in a number of ways, based on some parameters processed by my routine. Ads an example, this morning I sketched this non-assuming shape using the pen tool of AD: (The source is krtko.afdesign.) I exported it to SVG, then wrote some C code that calls my procedure (you can find it here, if interested), used OpenSCAD to turn it into STL and PrusaSlicer to prepare it for 3D printing (after I receive and assemble my new printer, of course). The result should be a nice little plastic coaster seen in this image (ignore the green part, that is just a support required for the printing):