Problem with my printer Nozzle Cleaning >< Crash detection  

RE: Problem with my printer Nozzle Cleaning >< Crash detection

There’s quite a few comments on this forum about the same issue. I definitely have the same issue and have not been able to resolve it yet.  Hoping Prusa gets back on this soon:

- https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/4773

- https://forum.prusa3d.com/forum/prusa-core-one-hardware-firmware-and-software-help/crash-detected-6/

RE: Problem with my printer Nozzle Cleaning >< Crash detection

It’s weird, I had this issue and started a thread about it, but it happened less and less often and now I never get the problem, it must be at least 2 months since it occurred.

I still get nozzle cleaning failed every now and again, but it’s nearly always when I have crap stuck to the nozzle and with PETG.

RE: Problem with my printer Nozzle Cleaning >< Crash detection

I actually swapped the start G-Code and started 3 prints without any problem.

https://forum.prusa3d.com/forum/postid/751199/

RE: Problem with my printer Nozzle Cleaning >< Crash detection

I've also had endless problems in the Z axis, both on initial homing ( I got around that problem by Tuning the Nozzle Temperature to zero right at the start of the print), and then later when nozzle cleaning. It seems that there is a problem with the loadcell if the nozzle is heating, it can produce false results and lead to crash detection, etc, even if a crash hasn't actually occurred.

I've been experimenting with adding the following line to the Start G-code: 

M104 S0

I initially added that before the first homing:

M84 E ; turn off E motor

; Insert here to disable heating before homing
M104 S0 ; disable hotend heating for initial homing

G28 ; home all without mesh bed level

This worked very well, no more need to reduce nozzle temp at the start of a print.

I then tried adding the same line just before the nozzle cleaning command:

M84 E ; turn off E motor
M104 S0
G29 P9 X208 Y-2.5 W32 H4

I've tested this several times and the printer homes and starts without any issues, print quality is good.

I should mention that I'm not an expert! Comments gratefully received 😊 

RE: Problem with my printer Nozzle Cleaning >< Crash detection

I chatted with tech support and after a few hours of troubleshooting they sent me some replacement parts.  I replaced the heatsink / loadcell this did not fix the problem, but replacing the main cable fixed the problem.