Newtons Gravity puzzle
thingiverse
Looking through instructables, I stumbled upon this (https://www.instructables.com/id/How-to-Make-a-Newtons-Gravity-Puzzle/) created by tomatoskins, and thought that would definitely be achievable in plastic. With ten minutes in TinkerCAD, here it is. Object - Remove the center piece without tools. You must keep the outer ring flat on a tabletop. It probably should be called Bernoulli's Principle Puzzle (wink). I'll let you figure out how to solve it. Or, you could visit the inspiring original instructables. The solution is at the bottom of the article. The concentric version prints quickly.
With this file you will be able to print Newtons Gravity puzzle 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 Newtons Gravity puzzle.