I bought this Polaroid Play 3D pen (now discontinued ... The incident occurred when I was patching up a hole on the back of one of my HueForge 3D prints, and since I was creating some content ...

It’s why desktop 3D printers ... are used for motion: 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.

We’ve seen some interesting innovations with filament holders before, like this entirely 3D printed filament holder, but a mini spool for a 3D pen is definitely a new one.