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No bearings. It only runs for a minute or two and doesn't have to keep time so some lightly greased 2mm axle rods and M4 button head hex bolts should provide low enough friction .
Once this is done I might see if I can 3d print all the metal parts to see if I can make the model 100% printable. Should just be doable with a few tweaks to the parts.
Stonehedge
Super cool. What do you do for bearings?