Detachable filament spool holder / mount

I needed a filament holder that could be pulled out to the top and didn't find one on thingiverse. So here it is.

It's designed to fit to a 20x20 aluminium extrusion.

Update 1:
- Further a M4x30 or longer can be bolted into the lever to give it more rigidy. The mounting holes are there.
- Made the lever a little bigger for better fitting.