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I've read that many people are having trouble with the wheels spinning freely. I can confirm that this model, when printed properly, WILL SPIN FREELY when trimmed correctly.

Of course, calibration of your printer is important here. I used a FlashForge Dreamer at Hyper quality (0.08mm layers). The high quality may not be so necessary, but it is crucial that your trim the parts thoroughly.

The inserts will snap into the base parts and are immovable there, while the wheels will snap onto these and should spin freely. If they are not spinning well, pull them off (rather easy to do) and trim both the inside of the wheel slot away, as well as the outside of that insert. When trimmed sufficiently, the wheels should spin several revolutions when you flick them with your finger. Hope this helps someone.