We can create art on paper ... your finger like a pen or paint brush on the screen of a tablet or smartphone. Slide 1 of 3, , Erasers can be used to rub out pencil on paper Mistakes made with ...

It’s why desktop 3D printers are such a ... one to spin the rod that advances the paper, and the other connected to a standard GT2 belt and pulley to move the pen back and forth.

It’s a simple robot that drags a pen around to draw on paper. [Tim] decided to build one ... drive the wheels via cogged belts, with the 3D-printed rims fitted with square rubber drive belts ...