Rat Rig Community [Unofficial]•8mo ago

Extruder temperature is going crazy.

If I leave the extruder heater at let say 250 celsius for 30 minutes is pretty stable. During the print is reaching insane high peaks. I've not been using the printer so much lately but last time there were no issue at all. Now I cannot complete even the firstlayer_test print which is a 25 minutes print. What's happening?

42 Replies

TheTik•8mo ago

Have you run a PID_CALIBRATE ?

MoophloOP•8mo ago

yes few minutes ago and without any issue

TheTik•8mo ago

those spikes actually seem too steep to be real thermistor might be going bad at those temps? and mis-reporting, causing the heater to turn on when it shouldn't be?

MoophloOP•8mo ago

maybe but how to fix. I've a genuine phaetus the one from the basic vcore standard kit is not supposed to fail after less than 50 hours print

MoophloOP•8mo ago

here the logs, don't know if it can help

klippy.log

TheTik•8mo ago

replace would be the fix and/or diagnostic step Actually, triple check the thermistor wiring too Does the PID_Calibrate show the same spikes?

MoophloOP•8mo ago

zero perfect

blacksmithforlife•8mo ago

Are you using the MAX31865 chip? I and others have had issue with that causing the PT1000 thermistor to read +/- 3℃

TheTik•8mo ago

So it only does it under heating AND motion, further suggesting its a wiring issue

MoophloOP•8mo ago

again i can leave the printer unattended at 240 celsius the temperature doesn't make a move, is a perfect flat line

TheTik•8mo ago

The spikes are bigger than that

MoophloOP•8mo ago

speaking of spikes of +160°

blacksmithforlife•8mo ago

yeah that sounds like a wiring issue if it is only happening while it is moving

MoophloOP•8mo ago

Write g-code response
Traceback (most recent call last):
  File "/home/pi/klipper/klippy/gcode.py", line 459, in _respond_raw
    os.write(self.fd, (msg+"\n").encode())
BlockingIOError: [Errno 11] Resource temporarily unavailable
Stats 6316.2: gcodein=0  mcu: mcu_awake=0.000 mcu_task_avg=0.000000 mcu_task_stddev=0.000000 bytes_write=3195 bytes_read=6745 bytes_retransmit=9 bytes_invalid=0 send_seq=268 receive_seq=268 retransmit_seq=2 srtt=0.001 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=179979189 Octopus: temp=0.0 raspberry_pi: temp=51.5  heater_bed: target=0 temp=0.0 pwm=0.000 sysload=0.71 cputime=381.499 memavail=434864 print_time=0.000 buffer_time=0.000 print_stall=0 extruder: target=0 temp=0.0 pwm=0.000

Write g-code response
Traceback (most recent call last):
  File "/home/pi/klipper/klippy/gcode.py", line 459, in _respond_raw
    os.write(self.fd, (msg+"\n").encode())
BlockingIOError: [Errno 11] Resource temporarily unavailable
Stats 6316.2: gcodein=0  mcu: mcu_awake=0.000 mcu_task_avg=0.000000 mcu_task_stddev=0.000000 bytes_write=3195 bytes_read=6745 bytes_retransmit=9 bytes_invalid=0 send_seq=268 receive_seq=268 retransmit_seq=2 srtt=0.001 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=179979189 Octopus: temp=0.0 raspberry_pi: temp=51.5  heater_bed: target=0 temp=0.0 pwm=0.000 sysload=0.71 cputime=381.499 memavail=434864 print_time=0.000 buffer_time=0.000 print_stall=0 extruder: target=0 temp=0.0 pwm=0.000

this is on the logs

blacksmithforlife•8mo ago

BlockingIOError: [Errno 11] Resource temporarily unavailable

what kind of SD card do you have and how old is it?

MoophloOP•8mo ago

on the raspberry you mean?

blacksmithforlife•8mo ago

yes

MoophloOP•8mo ago

is pretty new like 128GB

blacksmithforlife•8mo ago

what brand?

MoophloOP•8mo ago

I've to check for brand and model but high performance

blacksmithforlife•8mo ago

I trust the logs when it says it is having trouble writing to disk

MoophloOP•8mo ago

SanDisk 256GB Extreme Pro mmm

blacksmithforlife•8mo ago

yeah that should be a good card. Maybe it got damaged if you are seeing a lot of that in the logs

MoophloOP•8mo ago

Raspberry Pi Diagnostics - version 0.13
Sun Apr 21 22:22:22 2024

Test : SD Card Speed Test
Run 1
prepare-file;0;0;19793;38
seq-write;0;0;19464;38
rand-4k-write;0;0;2938;734
rand-4k-read;6829;1707;0;0
Sequential write speed 19464 KB/sec (target 10000) - PASS
Random write speed 734 IOPS (target 500) - PASS
Random read speed 1707 IOPS (target 1500) - PASS
Test PASS

Raspberry Pi Diagnostics - version 0.13
Sun Apr 21 22:22:22 2024

Test : SD Card Speed Test
Run 1
prepare-file;0;0;19793;38
seq-write;0;0;19464;38
rand-4k-write;0;0;2938;734
rand-4k-read;6829;1707;0;0
Sequential write speed 19464 KB/sec (target 10000) - PASS
Random write speed 734 IOPS (target 500) - PASS
Random read speed 1707 IOPS (target 1500) - PASS
Test PASS

I'm trying an fsck let see with no print running:

MoophloOP•8mo ago

TheTik•8mo ago

thats pretty steady with no movement

MoophloOP•8mo ago

meanwhle I'm running a benchmark:

MoophloOP•8mo ago

40 minutes without a single spike

MoophloOP•8mo ago

can this be the cause?

TheTik•8mo ago

Yeah, undervolting things wil result in unpredictable behavior. And a thermistor is just a resistor, so if you're trying to measure voltage drop...

MoophloOP•8mo ago

updates: changed RPI 3b+ with RPI 4 update2: the rPI is not powered anymore with GPIO, but has a separate power supply at 3A system load is under 0.5

MoophloOP•8mo ago

with some luck maybe I'll be able to complete firstlayer_test print but still it doesn't look good at all

MoophloOP•8mo ago

why? why? why? 😢 why the last 9 minutes of the print were stable? It was a wiring issue

TheTik•8mo ago

Tada! Glad you found it 😎

galile0•7mo ago

Hi, would you care to elaborate on what the wiring issue was? I am experiencing similar issue on my VC3.1 with Rapido PT1000. Might be in the same spot, considering it seems to be the same setup

MoophloOP•7mo ago

Most likely it was a cold soldering I put the temperature high and than with the hand I bended spot by spot all the wiring group from the hotend to the frame And found out that touching in a specific point the temperature was sky rocketing So as I'm a moron and I didn't want to disassemble and redo properly the junction I just put there ten zip ties at half a centimetre one from the other very very tight and the problem never showed again

galile0•7mo ago

Okay, thanks ill go bend some wires then

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Extruder temperature is going crazy.