Railcore II 300ZL CoreXY Filament Spool Holder & Filament Tube Guide

This is a spool holder and filament tube guide designed for the Railcore II 300ZL. This keeps the spool out of the way from anyone banging into it when walking by the front or side of the printer if you have it placed where this could be an issue. I didn't want to drill holes or pull the frame apart to change fasteners. There were some spare M3 nuts in the top extrusion already. The nylock nut is captured around the side to keep the spool from flexing it down or pulling it back.
The slots for