Sharpie holder for Ultimate Filament Colorer

[The Ultimate Filament Colorer](http://www.thingiverse.com/thing:312327) by beebenutz is the technique of colouring filament by passing it through the ink sponge inside a Sharpie marker before it feeds into the hotend. The pigment mixes with the plastic inside the hotend, producing a permanent colour that doesn't rub off.

If you want to try this out, I wrote a comprehensive guide to the technique [here](http://www.desiquintans.com/beebeguide).

I've also documented the colours you get when