Railcore II 300ZL (Halo) Rear Mounted Spool Holder

Inspired by jevs "Railcore II 300ZL CoreXY Filament Spool Holder" and Stevetecx's "Ultimaker 2(+) Bearing Filament Spool Holder" but wanted my spool behind the printer.
So I did a bit of remixing and came up with this.

You need to print the following:

1x spool_holder.stl
1x spool_holder_vert_bracket.stl
1x spool_holder_brace.stl
2x spool_holder_bearing_pin.stl

Hardware Needed:

2x 608 Bearings (22mmx8mmx7mm)
3x M3 x 16 or 20mm button head or cap head bolts (bolt the assembly together)
2x M3 x 16mm button head or cap head bolts (bolt the assembled spool holder to the
Railcore II 300ZL
3x M3 nylon-lock nuts or regular
5x M3 flate washers (optional)