Note: I printed at 70% scale with good results. Full scale would probably be too big for most doors.

This is a doorstop that I designed and printed for a basic 3D printing class that I'm taking. We had to design and print our own doorstop. Being a mechanical designer with experience, I didn't want to simply extrude a triangle, so I made a helical doorstop with a bonus feature.

When you look at the part from the correct angle, it looks like a typical octagonal stop sign (especially when painted). Also, the helical shape allows for tightening the doorstop under a door. This works surprisingly well on carpeted floors, but not so well on hard floors.