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Well after 4 tries I finally have a finished part that works. First one is the one that was 2x the size it should have been because I forgot I measured diameter but was entering radius in Sketchup. Second is the first in the 2nd picture, I made it slightly too small and printed it in the wrong orientation so it broke. Middle one I used the profile from the first and managed to screw up the radius of the circle I drew again. Attached a 20.1mm circle to the point that was supposed to be 17.3mm so it was too big. Next one I got right and you can see it fitting on. I might make it wrap around a little more and slightly smaller so it snaps on a bit more positively, but that one won't fall off on it's own so I'll likely leave it alone for now. Now it's time to design the case for my glasses.