I designed this spool holder because I want to upgrade my printer for dual filament printing.
I love top mounted spool holders but they seem a little flimsy to hold two filament spools.
I need a Hard-Core spool holder for this...
The spindle takes two 608Z skateboard bearings and all the parts are reinforced.
ATT: The tightness of the ny-loc nut adjusts the drag on the spindle so the spools don't unwind by themselves.
Updated 15/10/2017 Dual Spool Mount is here !!!
Updated 26/08/2018 added longer brackets, and a filament guide !!