Printed the small version with a heavily modified Monoprice Maker Select v2.1 with MakerGeeks Grey Matter PLA at .15mm. I had some internal stringing, and was worried it may not free up. But I got it loosened up using a small screwdriver to push on each bearing, left and right, until all had been freed. Then I pushed the handle of the screwdriver into the middle (it fit perfectly) for leverage to start turning it. I worked at it for a while until it was somewhat loose, then added mineral oil (I know, not the best) - and that made a huge difference. I then held it against a drill chuck, and spun it at high speed to further wear down the rough spots. It now spins relatively well, but stops spinning quickly - still a lot of rough spots. In any case, I'm pleased that it turned out at all!
Monoprice Maker Select v2.1