If we told you somebody built a 3D printed go-kart, you’d expect to see ... eventually fused together into 3D trusses using the 3D pen. The trusses are then mounted to the RC car chassis ...

Changing colors during a 3D print ... the print is resumed. There are some workarounds to this problem, but not many of them are as smooth an effortless as this one which uses erasable pen ink ...