Marble Roller Machine
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I built a marble machine years ago after seeing a picture and finally got around to making my own. It was a challenge to get the mechanism working as expected, but I eventually got it running smoothly. I remade the cup and adjusted the pivot point several times before getting it right. The final result is shown in the video. I made mine from wood, but you can try printing your own using the STL files provided. You'll need to supply 9/16" marbles on your own, or purchase similar versions from Amazon at http://amzn.to/2ClyTrw. For detailed build instructions, check out this Instructable: https://www.instructables.com/id/Wooden-Marble-Roller-Machine/.
With this file you will be able to print Marble Roller Machine with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Marble Roller Machine.