I did a print in PLA, and it had some heat creep, since I was still using the stock fan duct at 120mm/s (klipper), so the filament got stuck and heating the hotend to 215ºC makes no difference as it's stuck inside the heat break.
There is also no filament sticking out from the top or bottom.
I recently started using klipper to print faster and more efficiently, and after a while it started disconnecting randomly, then it was unable to connect with this error:
mcu 'mcu': Unable to connect
Once the underlying issue is corrected, use the
"FIRMWARE_RESTART" command to reset the firmware, reload the
config, and restart the host software.
Error configuring printer
Before anyone mentions changing the "mcu" it is like this:
[mcu]
serial: /dev/serial/by-id/usb-Klipper_lpc1769_11C0000C0019D895EAF47262C12000F5-if00
lsusb does not show any 3d printer on the USB ports neither does ls /dev/serial/by-id/*
Tried testing it with marlin and it also did not fix the problem.
I think the USB port is dead, but I posted this in case it's a rare issue that looks like a hardware problem.
Hardware:
SKR 1.4 Turbo on Ender 3 Pro
RPI4 with Raspbian Lite (Debian)
USB communication