The gravity potential for 5mm steel ball

These things have 2 diemensions, one is 320x280mm another is 260x200mm. It's the demo version for education purpose to demo the moving objects in gravitional potential well motions like black hole. Add 245mm for Bambu or other printer with 250mmx250mmx256mm plate to print. The 213mm is for Ender3V3 series with 220x220x240mm building form to print.
25/07/26 update : reinforce the support under well structure, separete the injector and update with coin size of Taiwanese $10 coin.
25/07/28 update : add 320 and revised 215mm size wells. Add the pre-tilt angle coin ejector.
25/07/30 add the video for coin rolling down to funnel. https://www.youtube.com/watch?v=DRL9j6LHJvY
25/08/01 upload the R^-0.6 well for longer cycloing time.