# Mini 1 Z-Axis "Chattering" - HELP!!

**URL:** <https://forum.lulzbot.com/t/mini-1-z-axis-chattering-help/7021>\
**Category:** LulzBot Mini\
**Created:** [November 14, 2019, 10:46pm UTC](https://forum.lulzbot.com/t/mini-1-z-axis-chattering-help/7021 "2019-11-14T22:46:43Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Seconds2go](https://avatars.discourse-cdn.com/v4/letter/s/3d9bf3/32.png) [@Seconds2go](https://forum.lulzbot.com/u/Seconds2go)\
**Post date:** [November 14, 2019, 10:46pm UTC](https://forum.lulzbot.com/t/mini-1-z-axis-chattering-help/7021/1 "2019-11-14T22:46:43Z")

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My trusty old Mini 1 has developed a problem. The Z-Axis motors have become very loud and are “Chattering”. Their movement is erratic and now all movement has stopped. I just re-flashed the firmware to try and fix the problem but no luck. Any ideas?  
Since the factory isn’t up yet with the new owners I thought I’d give you all a try…  
Mike

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**Author:** ![nopick](https://avatars.discourse-cdn.com/v4/letter/n/7bcc69/32.png) [@nopick](https://forum.lulzbot.com/u/nopick)\
**Post date:** [November 19, 2019, 4:11pm UTC](https://forum.lulzbot.com/t/mini-1-z-axis-chattering-help/7021/2 "2019-11-19T16:11:59Z")

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Check your wires and reseat your connections, just in case you have something going on there.

The most common cause of this condition is a failed Rambo board motor driver, unfortunately. Since the Z wiring harness doesn’t move, a broken wire isn’t very likely.

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**Author:** ![Seconds2go](https://avatars.discourse-cdn.com/v4/letter/s/3d9bf3/32.png) [@Seconds2go](https://forum.lulzbot.com/u/Seconds2go)\
**Post date:** [November 19, 2019, 4:28pm UTC](https://forum.lulzbot.com/t/mini-1-z-axis-chattering-help/7021/3 "2019-11-19T16:28:52Z")

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Thanks for the help.  
I did check the wiring and reset the connectors on the board to no avail.  
I did notice that the Z-axis motors moved slightly in BOTH directions with a single command to move up 5mm. That in essence must mean that the board is faulty.  
I’ve ordered a new board hoping to be back printing soon…

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**Author:** ![nopick](https://avatars.discourse-cdn.com/v4/letter/n/7bcc69/32.png) [@nopick](https://forum.lulzbot.com/u/nopick)\
**Post date:** [November 19, 2019, 6:26pm UTC](https://forum.lulzbot.com/t/mini-1-z-axis-chattering-help/7021/4 "2019-11-19T18:26:28Z")

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99.9% it is the board. I have seen this waaaaay too many times.