22mm bearing spool holder conversion

Edit 02/08/2017: after a while using this design, I'd recommend using something to make resistance. While this works really well for spools that are a little used, on new spools it tends to unravel a little. Basically it works too well.

Wanhao Duplicator i3 plus bearing spool holder conversion. Allows for the spools to be held in place and use bearing to unspool the plastic

The cone may have to be modified to fit some spools as they go on both sides of the spool (they may collide if spoo