A simple, stable 3D printed pen holder for everyday pens, pencils, markers, styluses, and similar cylindrical tools. The included OpenSCAD file is fully parametric (Customizer-ready), so you can set the inner diameter, height, wall thickness, bottom thickness, and chamfer to match what you want to store.a

Fit tip: measure your pen/marker’s widest diameter and set inner_d with ~0.3–0.6mm extra clearance for an easy slide-in fit (increase a bit more for rougher printers).

Printing: print upright, no supports needed. Suggested settings: 0.2mm layer height, 3 perimeters, 15–25% infill, brim optional. For extra weight/stability, increase bottom_wall (e.g. 4–6mm) and/or infill.