The file 'Coin Battery Charger 0.3$ (For Rechargeable Batteries Only) DIY 3D Printer Model' is (stl) file type, size is 11.2KB.
https://www.youtube.com/watch?v=ZtDn6eH3rlQ
DIY Coin Cell Battery Charger For 0.3$ (For Rechargeable Batteries Only) with LED indicators.
Watch the video to see it running in action.
Links for the parts are on YouTube video description.
Coin_battery_charger.stl | 46.5KB |