Quick Change Modular Low Friction Spool Arm for Lulzbot Mini

The original design was ugly as sin but it worked very well. The two problems I ran into over time were it was great for most 1kg spools but less so for smaller sizes and, if I was printing something with a ridiculous amount of retractions sometimes the spool would jump off (a wire tie on the end gets you by in this situation). I'm doing some other modifications so it seemed a good time to revisit and refine this design.

You'll need a 5/16x3-1/2 bolt and a couple 608 bearings. A piece of 5/16