# 3D printing home/calibration unstable?

**URL:** <https://forum.snapmaker.com/t/3d-printing-home-calibration-unstable/11220>\
**Category:** Snapmaker 2.0 (3-in-1)\
**Created:** [November 5, 2020, 1:09pm UTC](https://forum.snapmaker.com/t/3d-printing-home-calibration-unstable/11220 "2020-11-05T13:09:56Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![jmeckstroth](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/jmeckstroth/32/8074_2.png) [@jmeckstroth](https://forum.snapmaker.com/u/jmeckstroth)\
**Post date:** [November 5, 2020, 7:10pm UTC](https://forum.snapmaker.com/t/3d-printing-home-calibration-unstable/11220/3 "2020-11-05T19:10:18Z")

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@brent113. I will perform both of your suggested checks. Interesting that you did the Z-axis alignment from the Y-axis drives versus the bed. Thanks for the information!!

Question, have you observed non-unison movement of the Z-axis drives? I observe it at times during a Home operation. I may not be recalling correctly, but I think it may occur on upward motion, as if one z-axis drive continues to move after the other stops.

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