After heating/homing print never starts

General Discussion
1

Basic Information:

Printer Model: Ender 3 v3 SE
MCU / Printerboard: BTTPad 7
Host / SBC [No idea, sorry]
klippy.log klippy.zip (1.6 MB)

This is all fairly new to me, I got a printer and a bunch of upgrades/accessories as a gift and Ive been slowly attempting to utilize them and learn. I have klipper mostly successfully installed and I can control my printer through the BTTPad7 but after yesterday saw me attempt to add the Nebula camera to the mix things went sideways. Suddenly prints heat up and home, then go to squirt out that little line on the side but never do. They just sit there, I let one sit for over an hour to see if it was just being slow - but nothing. Im 100% sure I did something stupid as I have very little clue what Im doing. Ive spent the last 16 hours trying to figure out this problem myself and nothing I do/change has any effect.

Any help in this will be very appreciated.

2

Your hotend temperature never stabilizes enough for Klipper to start printing.

  • Try tuning PID as a first step
  • Make sure to have a silicone sock on the hotend
  • Make sure your fan is not directly blowing at it
  • In doubt, replace it
3

I’m still in the learning phase, how to read the klippy.log!

How did you find that hint in the klippy.log?

Is it

Endstop x still triggered after retract
Exiting SD card print (position 0)

?
e.g. Line 66212 to 66215 says

Stats 6679.0: gcodein=0  mcu: mcu_awake=0.001 mcu_task_avg=0.000011 mcu_task_stddev=0.000007 bytes_write=3940 bytes_read=10841 bytes_retransmit=9 bytes_invalid=0 send_seq=311 receive_seq=311 retransmit_seq=2 srtt=0.003 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=71999208 sd_pos=615 heater_bed: target=70 temp=69.2 pwm=0.385 sysload=0.04 cputime=42.344 memavail=649216 print_time=53.940 buffer_time=0.000 print_stall=0 extruder: target=250 temp=254.3 pwm=0.008
Endstop x still triggered after retract
Exiting SD card print (position 0)
Stats 6680.0: gcodein=0  mcu: mcu_awake=0.001 mcu_task_avg=0.000011 mcu_task_stddev=0.000007 bytes_write=4240 bytes_read=11090 bytes_retransmit=9 bytes_invalid=0 send_seq=327 receive_seq=327 retransmit_seq=2 srtt=0.003 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=71999202  heater_bed: target=0 temp=69.2 pwm=0.000 sysload=0.04 cputime=42.403 memavail=648744 print_time=54.663 buffer_time=0.000 print_stall=0 extruder: target=0 temp=255.3 pwm=0.008

It strikes me that the extruder target temperature switches from 250 to 0. So just this message between was a hint to the problem?

A " Knowledge Base article" about “how to read a klippy.log” would be great!