Circle square optical illusion. 3D printed with Elegoo Neptune 4. #illusion #3dprintingb Kōkichi Sugihara from Japan creates these optical illusions https://en.wikipedia.org/wiki/Kokichi_Sugihara 3D print files from thingiverse https://www.thingiverse.com/thing:2646065 3D Printed with Elegoo Neptune 4. Took about 20 minutes, not the time shown on screen. As an Amazon Associate I earn from qualifying purchases Amazon US & other Countries Links Elegoo Neptune store https://amzn.to/45YE8v4 3D printer filament https://amzn.to/3cSsc7x Isopropyl for printer bed cleaning https://amzn.to/3D1fDl8 Amazon UK Links Elegoo Neptune store https://amzn.to/43MQNzN 3D printer filament https://amzn.to/3qcB0bh Isopropyl for printer bed cleaning https://amzn.to/3RWgE27 - @leepspvideo