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3DPrinting
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I cannot see images ("these"), but if you are talking about some wheels, yes they should not be too tight neither too loose. Once tightened you should be able to turn them with your fingers without raising gantry but you should also feel friction.
Ah, it's the part that the screws actually use to move the head up and down to which I was referring. It's a couple black circles on the Prusa MK2.