Snap-on Lulzbot Mini 2 Spool Holder

I really like my Lulzbot Mini 2, but I didn't like the squeaking that sometimes happened as filament spools rubbed against the edge of the integrated folding arm. I tried a few different spool holder designs but couldn't find one that I really suited my needs, so I designed my own!

It's primarily a remix of Mike's Spool Holder, but rather than being a standalone design, mine is designed to snap onto the arm itself. That way, you get the benefit of reduced friction from the axle, as well as the security of the arm itself. (I found that when getting near to the end of a spool, the filament's memory and the movement of the printhead would yank the spool right off designs like TUSH--https://www.thingiverse.com/thing:2047554)