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With a caliper, verify the length of the build_helper_z. It must be:

106mm +/- 0.5mm for the MK3(S)(+) or MK2.5(S)(+)

96mm +/- 0.5mm if you have the MK2(S) or MK2.5(S) Bear 2.0 older shorter frame

In case it is too long you can file one of the end.

In case it is too short you can scale it using PrusaSlicer and reprint.

Only use one build helper. This is to ensure that both z extrusions are set to the same distance.

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