3Dprinting Illusion !?
Paradox Illusions Design ! "Penrose triangle"
Printing do not require support. (Case by case)
Update! Mar 12, 2015
I to adjust the accuracy of overlap of the corner .
Perspective approaches a little .
Penrose triangle - 3D Printing Time-lapse by 3D Shrink
Change from viewpoint ! New Ver 2017