Inspired by Mini Travel Yahtzee. I wanted a set that fits a full size pen. The clip is for 3x5 index card scorecards, also attached. My dice measure 15mm cube and the pen I'm using is a Zebra F-701. The f3d file has user parameters (Modify→User Parameters) for these sizes if another size is desired.

Depends on a 2.5mm x 100mm aluminum rod (non-affiliate Amazon link). A length of filament will work too, but it might be a bit loose. (As with the source model)

Printed with Cura. The lid was up 90° and 180° from the base. 20% infill and tree supports.