Prusa i3 Plate mounted dual spool filament holder

thingiverse

Attach two filament spools to your Prusa i3's 6mm aluminum plate by printing dual plate mounts and four spindle holders. Use four M6 nuts, washers, and rods (each ~150mm long) for each mount, and fit a spindle holder on the other end of each rod. Print four spool adapters from Thingiverse (http://www.thingiverse.com/thing:60723), attach two to each spool along with M8 threaded rods, then place them into the spindle holders.