As I was scrolling the internet to find a rolling number counter for kids, I realized that this is the perfect method to make a dice for boardgames! 

This is a modular system and can be expanded by simply adding more rollers. It makes use of easy to find magnets, nuts, and bearings. 

Printing with

Nozzle 0,6mm

Layer height 0,2mm

infill 15%

no supports

Requirements:

2 x Standard 608 ball bearing outer diameter 22mm, inner diameter 8mm, width 7mm

12 x Standard M4 nuts (Makes sure they are magnetic) 

2 x permanent magnet Diameter 10mm, width 6mm