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Thank you for reporting. These indicators are downloaded tens of times a day, including the many derivatives even more and this is the first report of this phenomena. Please check again. I trust you have made a version with a 8 mm x 3 mm Neodymium magnet - correct? The hole in the NEMA motor is 8.5 mm, so even off center, it will only be minimal, however the friction should not be so high that the indicator does not turn. I do not know how new your Prusa is, but just FYI: I have received my MMU2 some 3 months ago and all three stepper motors perfectly 'accept' the 8mm indicator.