MakerFarm i3v Spool Holder Replacement

This design replaces the laser cut wood spool holder that comes with the MakerFarm 10" i3V 3D printer. I found the stock spool holder can require a far bit of inertia in order to rotate the filament spool which can cause under-extrusion. The new spool holder allows for much easier rotation of the filament spool.

The new design uses a 10mm wooden dowel to support the filament spool. A 20mm spacer is pressed onto the 10mm dowel to add more clearance between the spool and the bottom of the sp