Summary

This is a remix of my filament holder. Replaced the base part with 2 threaded roads to make the width variable.
The original anet filament holder doesn't spin realy smooth, so made this design with 608 bearings.

You need:
2x 608 ball bearing
12x M8 nuts
3x threaded roads M8x 180mm (or which size you like, the top could be a littlie longer)
8 x M8 washer (If you like)
And the famous Ultimate Spool Adapter | Fastswitch Filament from vidschofelix (http://www.thingiverse.com/thing:1874612)