impossible object puzzle square circle triangle in one shape —

Founded impossible object puzzle square circle triangle in one shape models & stl files for printing
Puzzle cube
rafaelborri1
Spine shaped USB case
HazimAminuddin
12 Geometric Shapes
ronaldfines
12 Stackable Shapes
ronaldfines
Simple Vase
Jangles1981
Scotty Dogz
muzz64
Bugz
muzz64
LED module
BenWittbrodt