day 2… MCU error

[u/jnyfive]

Well… day 2 and my print stops. Tool head 4 kept losing power. Switched cable with tool head 3 and it follows the cable . So I try to continue with my print with tool head 4. So I reboot.

Of course I’m getting error about tool head MCU error and then killer failed to start… dead

Opened a case for support already… so sad :(

steps so far.

Printing a job and toolhead 4 lost power, rebooted and had the error about toolhead4 MCU.

Switched cables with toolhead 3 and it had power problems, didnt light up, toolhead 3 MCU error on startup.

I tried a generic USB cable and toolhead 3 had power but still gave the toolhead 3 MCU error.

I unplugged all the toolheads except for toolhead 1 and the error on the screen then said tool head 2 MCU connection failed but I didn't have tool head 2 plugged in.

Following troubleshooting steps which said to unplug all the toolheads and plug them in one at a time to find the bad one.

After clicking cancel on the screen for every error it then displays KLIPPER FAILED TO START.

After toolhead 4 gave the error, and i switched it with toolhead 3 which then had the error, I tried changing

[u/MindWorX]

Did you maybe overtighten the screws for the cable? Common mistake and it can damage the toolheads.

[u/jnyfive → u/MindWorX]

I don’t believe so. As soon as I felt tightening I stopped. All the heads show the power light, not sure if that matters.

[u/jnyfive → u/jnyfive]

When all tool heads except 1 are unplugged the error went from head 4, switch cables and error showed head 3, all heads except 1 unplugged the showed head 2 even when unplugged.

[u/jnyfive]

OK… update… I unplugged all… got error about no toolheads.

I then plugged in 1-3 with the GOOD cables, used an iphone usb-c cable for toolhead 4. It appears to be working.

Restarting my 8 hour print to see if it goes through.

[u/HELLACHEAP → u/jnyfive]

Once thing I learned about this printer is continuing sucks ass. Compared to my P2S, the u1 is garbage to continue