Mendelmax 2 Filament Spool Holder - Simple

This is a collection of parts I have used to make a real simple Filament Spool Holder.

I wanted a "sit on top" design that hugs the 2020 Aluminium Extrusion.
Some parts are from other designs here on Thingiverse.

Parts Required - (all supplied here .. but sources also below)
- 2x Cone Spool Bearing Supports - http://www.thingiverse.com/thing:144353
- 2x Support Arms - http://www.thingiverse.com/thing:165150)
- 2x Bearing spacers - (sized 8mm inner, 11.6mm outer to match bea