M5 5mm Spool Holder

Thanks to the original creator for creating this and including the freecad file. I used that, exported the step file and imported into into onshape, then remixed it with the following:

1. protrusion in the rear narrowed to fit a 5mm gap 2020 extrusion.
2. mounting hole widend for an M5x10mm bolt
3. Rear mount section thickened by 4mm
4. front spool lip thickend by 3mm
5. fillets for strength and to prevent the spool from riding either end.