# Maslow 4.1 bottom left belt motor doesn't retract

**URL:** <https://forums.maslowcnc.com/t/maslow-4-1-bottom-left-belt-motor-doesnt-retract/24196>\
**Category:** Troubleshooting\
**Created:** [May 26, 2025, 10:06am UTC](https://forums.maslowcnc.com/t/maslow-4-1-bottom-left-belt-motor-doesnt-retract/24196 "2025-05-26T10:06:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jimmy](https://avatars.discourse-cdn.com/v4/letter/j/ee59a6/32.png) [@Jimmy](https://forums.maslowcnc.com/u/Jimmy)\
**Post date:** [May 26, 2025, 10:06am UTC](https://forums.maslowcnc.com/t/maslow-4-1-bottom-left-belt-motor-doesnt-retract/24196/1 "2025-05-26T10:06:51Z")

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Hi,

I am currently having an issue with the bottom left belt motor.  
When pressing retract all, the bottom left motor will only retract about 2-3 cm each time, even at 2100 retraction force.  
After reinstalling the firmware update, the belt did retract all the way, but now it stopped working again.

I have changed the bottom left arm with the bottom right arm, but the bottom left still doesnt work. (indicating it isn’t the motor itself but the main board maybe?)

I have added a video below.

[![](https://img.youtube.com/vi/wQAFY80129s/maxresdefault.jpg "Maslow 4.1 bottom left belt motor doesn't retract") ](https://www.youtube.com/watch?v=wQAFY80129s)

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**Author:** ![md8n](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/md8n/32/28197_2.png) [@md8n](https://forums.maslowcnc.com/u/md8n)\
**Post date:** [May 29, 2025, 3:26am UTC](https://forums.maslowcnc.com/t/maslow-4-1-bottom-left-belt-motor-doesnt-retract/24196/2 "2025-05-29T03:26:09Z")

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Here’s some suggestions based on my experience:

[Communications and belt retraction issues on a cold day - Troubleshooting - Maslow CNC Forums](https://forums.maslowcnc.com/t/communications-and-belt-retraction-issues-on-a-cold-day/23373/2)

[15mm error and friends - retraction problems especially - Wiki - Maslow CNC Forums](https://forums.maslowcnc.com/t/15mm-error-and-friends-retraction-problems-especially/23328)

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<div class="post-metadata">

**Author:** ![bar](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/bar/32/10_2.png) [@bar](https://forums.maslowcnc.com/u/bar)\
**Post date:** [May 29, 2025, 6:23pm UTC](https://forums.maslowcnc.com/t/maslow-4-1-bottom-left-belt-motor-doesnt-retract/24196/3 "2025-05-29T18:23:38Z")

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What happens if you extend that belt out by running extend all and pulling on it?

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<div class="post-metadata">

**Author:** ![Jimmy](https://avatars.discourse-cdn.com/v4/letter/j/ee59a6/32.png) [@Jimmy](https://forums.maslowcnc.com/u/Jimmy)\
**Post date:** [May 29, 2025, 8:08pm UTC](https://forums.maslowcnc.com/t/maslow-4-1-bottom-left-belt-motor-doesnt-retract/24196/4 "2025-05-29T20:08:37Z")

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Extending all works fine, but it will only retract 2-3 cm each time I press retract all. Eventually got it to retract all the way (spamming the button), but also during calibration, it only extends and doesn’t retract. I have tried extending all after, but it still doesn’t retract all the way. A new main board is on its way right now, hopefully that will fix the problem.