Reply To: Z axis Shuddering and inaccurate

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If you bought it from me it could be a few things. Your anti-backlash spring could be too tight, or just take it all together, most people are over doing this. Your plunge rate could be too high, or your rapids.

If you did not get it from me there could be a few more issues.

If you are sure those are not your issues you can try the new firmware. here