I used a wooden one as a template, which I made a few decades ago as part of a training course at the Institute for Teacher Training … I thought it might be something for the 3D printing community. Video: https://www.youtube.com/watch?v=7vd5C4aaPB4 Dimensions: L 230 mm W 70 mm H 55 mm Files to print: Pencil case_bottom.stl Pencil case_cover.stl Pencil case_top.stl Print Settings: Printer brand: Prusa Printer: MK3S Supports: No Resolution: 0,2 Infill: 15% Filament brand: Prusa; Geetech Filament color: Galaxy Black; Silky SIlver Filament material: PLA Remark: As all parts are designed to fit very precisely, it may happen that you have to rework one or the other part a bit with sandpaper and/or cutter due to different dimensional accuracy of the printers and the different behavior of the filaments.