This is my take on a cool looking doorstop I saw online. I played around with the size and made it voronoi. The version with ridges works on hardwood and other smooth surfaces.
Now on MyMiniFactory
How it works:
The design is pretty straightforward. Hook the UltiStop under a door or window with the large side facing the direction of motion. When the door/window tries to move, the UltiStop will rock back and prevent further movement.
Note: You may need to scale up design for doors raised well above floor level
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For doors that are raised more than an inch (2.54cm) above the floor, scale up around 110%.