impossible object puzzle square circle triangle in one shape —

Founded impossible object puzzle square circle triangle in one shape models & stl files for printing
Sphericon
alanmak
Nonalaef Uararo
adrian_liehner
Sacred Water
Scan The World
cookie box puzzle
spool2kool
Flexible Bracelet
MarcozBass
Heptiamonds puzzle
elektronchika
Ostomachion
lammatt