Seriously another prusa spool mount

I know there are plenty of these out there, but here's what I wanted:

Mounted on the Prusa: I didn't want to drill holes in my walls, and desk space is at a premium for now.

Low friction or otherwise set it and forget it-ish: The best success I had previous to this was leaving the spool on its side on the floor. I had to check it from time to time but it usually worked out OK.

So really, nothing too crazy. This is what I came up with. It attaches to the z-mount instead of the regul