Agree, strange. Could it be something in your G-code?
I would just do it and try another print.
I checked the macro where I can test the axis and speed. After changing the direction of the test, the printer lost contact with the MCU again. It turns out that it is not caused by gcode.
klippy.log (2.3 MB)
Stats 782.4: gcodein=0 mcu: mcu_awake=0.007 mcu_task_avg=0.000017 mcu_task_stddev=0.000013 bytes_write=109430 bytes_read=237890 bytes_retransmit=9 bytes_invalid=0 send_seq=7499 receive_seq=7499 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=64001204 heater_bed: target=0 temp=24.4 pwm=0.000 sysload=1.11 cputime=36.232 memavail=783348 print_time=790.014 buffer_time=4.954 print_stall=5 extruder: target=0 temp=33.3 pwm=0.000
Stats 783.4: gcodein=0 mcu: mcu_awake=0.007 mcu_task_avg=0.000017 mcu_task_stddev=0.000013 bytes_write=109548 bytes_read=238180 bytes_retransmit=9 bytes_invalid=0 send_seq=7508 receive_seq=7508 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=64001204 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=1.11 cputime=36.275 memavail=783096 print_time=790.014 buffer_time=3.952 print_stall=5 extruder: target=0 temp=33.3 pwm=0.000
Stats 784.4: gcodein=0 mcu: mcu_awake=0.019 mcu_task_avg=0.000035 mcu_task_stddev=0.000039 bytes_write=109666 bytes_read=238485 bytes_retransmit=9 bytes_invalid=0 send_seq=7517 receive_seq=7517 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=64001204 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=1.11 cputime=36.316 memavail=783096 print_time=790.014 buffer_time=2.951 print_stall=5 extruder: target=0 temp=33.3 pwm=0.000
Stats 785.4: gcodein=0 mcu: mcu_awake=0.019 mcu_task_avg=0.000035 mcu_task_stddev=0.000039 bytes_write=110654 bytes_read=238875 bytes_retransmit=9 bytes_invalid=0 send_seq=7540 receive_seq=7540 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=44 upcoming_bytes=0 freq=64001204 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=1.11 cputime=36.367 memavail=782844 print_time=790.586 buffer_time=2.522 print_stall=5 extruder: target=0 temp=33.2 pwm=0.000
Stats 786.4: gcodein=0 mcu: mcu_awake=0.019 mcu_task_avg=0.000035 mcu_task_stddev=0.000039 bytes_write=111725 bytes_read=239240 bytes_retransmit=9 bytes_invalid=0 send_seq=7564 receive_seq=7564 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=58 upcoming_bytes=0 freq=64001208 heater_bed: target=0 temp=24.2 pwm=0.000 sysload=1.03 cputime=36.419 memavail=783156 print_time=791.184 buffer_time=2.121 print_stall=5 extruder: target=0 temp=33.2 pwm=0.000
Stats 787.4: gcodein=0 mcu: mcu_awake=0.019 mcu_task_avg=0.000035 mcu_task_stddev=0.000039 bytes_write=113790 bytes_read=239680 bytes_retransmit=9 bytes_invalid=0 send_seq=7603 receive_seq=7603 retransmit_seq=2 srtt=0.001 rttvar=0.000 rto=0.025 ready_bytes=37 upcoming_bytes=0 freq=64001213 heater_bed: target=0 temp=24.0 pwm=0.000 sysload=1.03 cputime=36.480 memavail=783164 print_time=792.480 buffer_time=2.416 print_stall=5 extruder: target=0 temp=33.1 pwm=0.000
Stats 788.4: gcodein=0 mcu: mcu_awake=0.019 mcu_task_avg=0.000035 mcu_task_stddev=0.000039 bytes_write=114849 bytes_read=240070 bytes_retransmit=9 bytes_invalid=0 send_seq=7626 receive_seq=7626 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=51 upcoming_bytes=0 freq=64001216 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=1.03 cputime=36.532 memavail=783164 print_time=793.179 buffer_time=2.114 print_stall=5 extruder: target=0 temp=33.2 pwm=0.000
Stats 789.4: gcodein=0 mcu: mcu_awake=0.016 mcu_task_avg=0.000033 mcu_task_stddev=0.000037 bytes_write=116470 bytes_read=240501 bytes_retransmit=9 bytes_invalid=0 send_seq=7658 receive_seq=7658 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=64001223 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=1.03 cputime=36.588 memavail=783412 print_time=794.290 buffer_time=2.224 print_stall=5 extruder: target=0 temp=33.1 pwm=0.000
Stats 790.4: gcodein=0 mcu: mcu_awake=0.016 mcu_task_avg=0.000033 mcu_task_stddev=0.000037 bytes_write=117562 bytes_read=240861 bytes_retransmit=9 bytes_invalid=0 send_seq=7681 receive_seq=7681 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=64001227 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=1.03 cputime=36.640 memavail=783668 print_time=795.073 buffer_time=2.006 print_stall=5 extruder: target=0 temp=33.1 pwm=0.000
Stats 791.4: gcodein=0 mcu: mcu_awake=0.016 mcu_task_avg=0.000033 mcu_task_stddev=0.000037 bytes_write=119100 bytes_read=241286 bytes_retransmit=9 bytes_invalid=0 send_seq=7711 receive_seq=7711 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=64001231 heater_bed: target=0 temp=24.2 pwm=0.000 sysload=0.94 cputime=36.698 memavail=783728 print_time=796.312 buffer_time=2.244 print_stall=5 extruder: target=0 temp=33.1 pwm=0.000
Stats 792.4: gcodein=0 mcu: mcu_awake=0.016 mcu_task_avg=0.000033 mcu_task_stddev=0.000037 bytes_write=120187 bytes_read=241646 bytes_retransmit=9 bytes_invalid=0 send_seq=7734 receive_seq=7734 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=64001235 heater_bed: target=0 temp=24.2 pwm=0.000 sysload=0.94 cputime=36.752 memavail=785204 print_time=797.179 buffer_time=2.111 print_stall=5 extruder: target=0 temp=33.0 pwm=0.000
Stats 793.4: gcodein=0 mcu: mcu_awake=0.016 mcu_task_avg=0.000033 mcu_task_stddev=0.000037 bytes_write=121267 bytes_read=242006 bytes_retransmit=9 bytes_invalid=0 send_seq=7757 receive_seq=7757 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=64001237 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=0.94 cputime=36.806 memavail=784720 print_time=798.081 buffer_time=2.012 print_stall=5 extruder: target=0 temp=33.0 pwm=0.000
Stats 794.4: gcodein=0 mcu: mcu_awake=0.018 mcu_task_avg=0.000034 mcu_task_stddev=0.000039 bytes_write=122882 bytes_read=242461 bytes_retransmit=9 bytes_invalid=0 send_seq=7790 receive_seq=7790 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=15 upcoming_bytes=0 freq=64001236 heater_bed: target=0 temp=24.2 pwm=0.000 sysload=0.94 cputime=36.865 memavail=784720 print_time=799.497 buffer_time=2.426 print_stall=5 extruder: target=0 temp=33.0 pwm=0.000
Stats 795.4: gcodein=0 mcu: mcu_awake=0.018 mcu_task_avg=0.000034 mcu_task_stddev=0.000039 bytes_write=123949 bytes_read=242826 bytes_retransmit=9 bytes_invalid=0 send_seq=7814 receive_seq=7814 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=44 upcoming_bytes=0 freq=64001234 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=0.94 cputime=36.916 memavail=784248 print_time=800.483 buffer_time=2.412 print_stall=5 extruder: target=0 temp=33.0 pwm=0.000
Stats 796.4: gcodein=0 mcu: mcu_awake=0.018 mcu_task_avg=0.000034 mcu_task_stddev=0.000039 bytes_write=125100 bytes_read=243110 bytes_retransmit=514 bytes_invalid=0 send_seq=7839 receive_seq=7830 retransmit_seq=7839 srtt=0.000 rttvar=0.000 rto=0.100 ready_bytes=7 upcoming_bytes=0 freq=64001234 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=0.95 cputime=36.974 memavail=784248 print_time=801.503 buffer_time=2.431 print_stall=5 extruder: target=0 temp=33.0 pwm=0.000
Stats 797.4: gcodein=0 mcu: mcu_awake=0.018 mcu_task_avg=0.000034 mcu_task_stddev=0.000039 bytes_write=125243 bytes_read=243110 bytes_retransmit=2172 bytes_invalid=0 send_seq=7842 receive_seq=7830 retransmit_seq=7842 srtt=0.000 rttvar=0.000 rto=0.800 ready_bytes=308 upcoming_bytes=495 freq=64001234 heater_bed: target=0 temp=24.3 pwm=0.000 sysload=0.95 cputime=37.005 memavail=784256 print_time=802.556 buffer_time=2.484 print_stall=5 extruder: target=0 temp=33.0 pwm=0.000
Stats 798.4: gcodein=0 mcu: mcu_awake=0.018 mcu_task_avg=0.000034 mcu_task_stddev=0.000039 bytes_write=125301 bytes_read=243246 bytes_retransmit=2865 bytes_invalid=0 send_seq=7843 receive_seq=7831 retransmit_seq=7843 srtt=0.000 rttvar=0.000 rto=1.600 ready_bytes=750 upcoming_bytes=466 freq=64001234 heater_bed: target=0 temp=24.2 pwm=0.000 sysload=0.95 cputime=37.028 memavail=784204 print_time=803.096 buffer_time=2.022 print_stall=5 extruder: target=0 temp=32.9 pwm=0.000
Stats 799.4: gcodein=0 mcu: mcu_awake=0.018 mcu_task_avg=0.000034 mcu_task_stddev=0.000039 bytes_write=125301 bytes_read=243246 bytes_retransmit=2865 bytes_invalid=0 send_seq=7843 receive_seq=7831 retransmit_seq=7843 srtt=0.000 rttvar=0.000 rto=1.600 ready_bytes=750 upcoming_bytes=1399 freq=64001234 heater_bed: target=0 temp=24.2 pwm=0.000 sysload=0.95 cputime=37.055 memavail=785264 print_time=804.200 buffer_time=2.126 print_stall=5 extruder: target=0 temp=32.9 pwm=0.000
Stats 800.4: gcodein=0 mcu: mcu_awake=0.018 mcu_task_avg=0.000034 mcu_task_stddev=0.000039 bytes_write=125301 bytes_read=243246 bytes_retransmit=3558 bytes_invalid=0 send_seq=7843 receive_seq=7831 retransmit_seq=7843 srtt=0.000 rttvar=0.000 rto=3.200 ready_bytes=750 upcoming_bytes=2317 freq=64001234 heater_bed: target=0 temp=24.2 pwm=0.000 sysload=0.95 cputime=37.082 memavail=784960 print_time=805.338 buffer_time=2.263 print_stall=5 extruder: target=0 temp=32.9 pwm=0.000
Stats 801.4: gcodein=0 mcu: mcu_awake=0.018 mcu_task_avg=0.000034 mcu_task_stddev=0.000039 bytes_write=125301 bytes_read=243246 bytes_retransmit=3558 bytes_invalid=0 send_seq=7843 receive_seq=7831 retransmit_seq=7843 srtt=0.000 rttvar=0.000 rto=3.200 ready_bytes=750 upcoming_bytes=3243 freq=64001234 heater_bed: target=0 temp=24.2 pwm=0.000 sysload=0.95 cputime=37.109 memavail=785012 print_time=806.510 buffer_time=2.435 print_stall=5 extruder: target=0 temp=32.9 pwm=0.000
Timeout with MCU 'mcu' (eventtime=802.408152)
Transition to shutdown state: Lost communication with MCU 'mcu'
Not an expert on these numbers, but for me it seems the board’s connection starts stalling over multiple seconds before the crash.
The problem likely is that these numbers do not tell you the reason.
And do you know what is causing this?
Unfortunately not, except the “usual suspects” already mentioned in the link above.
Maybe someone else has an idea? I’m about to change the power supply, so I’ll check it again
Unfortunately, after replacing the power supply, the power was the same. On a regular axis test, the MCU lost connection.
klippy (2).log (33.0 KB)
I only left the motor options in printer.cfg and during the axis test it still loses connection with the MCU, the clipper was reinstalled, the SD card was replaced, the power supply was also checked, a different one. I don’t know what could be wrong anymore.
klippy (3).log (259.9 KB)
I unplugged the connected screen and the error is gone. Klipper no longer loses communication. Do you have any advice on what to do? Buy shielded cables for the screen?
Interesting. Thanks for sharing.
My advice: Go for a nice touch screen with KlipperScreen
Do you know any 7-inch screen worth recommending?
See Hardware known to work with KlipperScreen - #74 by CADburry and choose your poison.
But more seriously:
I unfortunately have a screen (only for testing purposes, never used it really. Only have it to give the appearance that I know what I’m talking of when it comes to KlipperScreen) that does not allow turning off the backlight via software and I find this super annoying.
Unfortunately, I cannot give you a good recommendation.
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