Coloring 3D printer filament with a Sharpie

Making colorful 3D prints with white ABS plastic.

Thingiverse user cyclone designed this handy device to add color to 3D prints using a couple Sharpies. If you have a large quantity of white ABS and you’re bored of the color, this would be a great way to add some variety without buying new plastic.

Cyclone is not the first person to do something like this, he says he used thing #5570 as a starting point; but this looks like the most well-refined design so far.