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I picked this printer up with a bunch of filament for $60. The build plate was really loose so I took it apart and found that the bearings are loose within the plastic part. Not really sure what to do here. I might epoxy the bearings in place. I saw that there is a y axis linear rail upgrade for $40 but that seems like a waste of money.
If the bearing were loose on the shaft, this would be a different conversation entirely.
If adjustment/refinement of the fit in the housing were out of the question, it shouldn't be made out of plastic, but even in the world of metal-cutting machine tools, adjustment is often neccessary, and if a shim, spacer or set-screw does the job, its what is done.
Meanwhile, my own suggestion was, first, the upgrade kit.