Maslow 4.1 bottom left belt motor doesn't retract

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.

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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

15mm error and friends - retraction problems especially - Wiki - Maslow CNC Forums

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

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.

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