[Don't redo layers when pausing for color change]

I'm doing a two color print with the Pause At Z plugin.

It pauses at the correct layer, but after resuming, it repeats the last two layers, which ruins the print.

I realize that there is a "redo layers" option, but I set it to 0.

I'm using Cura, Octoprint and an UMO.

What am I doing wrong?

[UMO makes bad movements and loud noise]

I'M PRINTING AGAIN!

Turns out, out of the two replacement driver boards I bought, only one was working.

Thank you so much to everyone who helped!

[UMO makes bad movements and loud noise]

Unfortunately I physically destroyed the original driver that wasn't working. So I need to find a way to get the A4988 drivers to work or buy other ones.

The cooling should be enough since the other 3 motor drivers work. Altough I'll replace the fan once all the motors work again.

[UMO makes bad movements and loud noise]

I just checked the driver PCBs. The old and new ones all have Vref = 0.7V. Which voltage or motor current should I use?

About the airflow: The fan is very loud, maybe it doesn't run smoothly.

[UMO makes bad movements and loud noise]

I can tell the drivers apart, since I have 3 working ones, one broken one (grinding noise) and two new ones (no noise or movement at all).

In this post, it seems like the A4988 drivers are shipped with the UMO.

Accodring to this page, the 83 and 88 are compatible, except the 88 has overheat protection.

[UMO makes bad movements and loud noise]

I tried to look at the broken driver PCB but I didn't see anything unusual.

I also bought an A4988 stepper driver and put it on the printer. It doesn't make the motor move at all (no stuttering either). Is there anything I need to do with the new driver? Can I use an A4988 at all?

[UMO makes bad movements and loud noise]

Hi,

I just swapped the motor connectors and now the Y axis is broken while the X axis works.

This confirms that the problem is somewhere on the PCB and not a mechanical issue.

Pulling the driver out and putting it back in solved the problem, but after a minute of printing it was broken again.

Should I buy a new driver? Or should I solder the current one to the board?

[UMO makes bad movements and loud noise]

This didn't solve it unfortunately. The pulley belt on the X axis is now tighter than the one on the working axis. I made another print today and it failed like the video shows, though it worked for 30mins.

[UMO makes bad movements and loud noise]

Hi,

Here is a video of my problem:

 

- the UMO works fine for a few minutes

- then it goes to crazy mode. It makes a loud grinding noise and moves away from the part

- I have made successful prints before

- The head can be moved around easily

- The pulley screws are tight

- I added sewing machine oil to the axes, now they move even smoother but the problem persists.

- Only the X axis has a problem.

What's the problem with my printer and how can I fix it?

Thanks in advance!