stackable counter ring or stamp

Just Add number rings as you need them

Modular counter rings e.g. for games.

Or number stamp.

Use 2× 15mm filament pieces to hold a rubber band (or spring) between the end discs.

Use the rubber band hook to thread the rubber band through the discs.

(alternatively you can press in ∅8×5mm magnets)

Design by Jack on MakerWorld (license: CC0).