double row penholder

thingiverse

When making a single ring variant for more than 20 pens, it grows excessively large. Adding another row helps keep it compact. It's likely that this design can be modified to accommodate multiple rows. The two photos show the initial prints (white on a BCN3D Sigma at high quality) and the "silver" on a Prusa i3 MK2. A 9.5 mm pen diameter is probably smaller than ideal, but it turned out as specified in the SCAD file. By the way, I use OpenSCAD on Linux to generate an STL file, which my colleague then slices in Cura on Windows for the specific printer.