Extruder Temp Reading Very High
I recently installed a new Phaetus Rapido 2 extruder and am getting readings that my temp is extremely high. Not exactly sure what's going on here, but I put the cables in the same ports as usual. Any ideas?
Solution:Jump to solution
Thank you for your help @Rigattoni and @blacksmithforlife 🇺🇸 it was the thermistor or wiring, but either way we are operational again 🙂
103 Replies
[extruder]
Check https://www.klipper3d.org/Pressure_Advance.html for pressure advance tuning.
#pressure_advance: 0.05
nozzle_diameter: 1.0 # Remember to change this if you change nozzle diameter.
dir_pin: e_dir_pin # Remove ! in front of pin name to reverse extruder direction
control: pid
pid_kp: 28.413
pid_ki: 1.334
pid_kd: 151.300
min_extrude_temp: 60
Your new hotend probably has a different kind of thermistor than your old one. You will need to update your config for the new thermistor (the rapido 2 should come with a 104NT thermistor).
Thanks @Max for your help
I confirmed it is P1000 thermistor based on the Amazon page for Rapido 2 where I bought it and applied the following settings to printer.cfg based on requirements found on https://www.klipper3d.org/Config_Reference.html#directly-connected-pt1000-sensor with my BTT Octopus board
[extruder]
#pressure_advance: 0.05
nozzle_diameter: 1.0 # Remember to change this if you change nozzle diameter.
dir_pin: e_dir_pin # Remove ! in front of pin name to reverse extruder direction
control: pid
pid_kp: 28.413
pid_ki: 1.334
pid_kd: 151.300
min_extrude_temp: 60
sensor_type: PT1000
sensor_pin: PF4
heater_pin: PA2
pullup_resistor: 4700
I am still seeing a wildly negative value for the MCU readout and am not sure why. Brand new cables are connected fine
Get rid of that config stuff. All you need to do is specify the sensor type.
And follow the wiring diagram from Rat-OS
Thanks @blacksmithforlife 🇺🇸 - but when I do that I get the following error.
Option 'control' in section 'extruder' must be specified
Once the underlying issue is corrected, use the "RESTART"
command to reload the config and restart the host software.
Printer is halted
Additionally, after trying to add this back in:
control: pid
pid_kp: 28.413
pid_ki: 1.334
pid_kd: 151.300
I received some of the same errors I was getting before regarding ADC being out of range / forced shutdown
+ printer.cfg for reference.
This is a V-Core 3.1 500x500
As far as I can see, you are using RatOS 2.0 still. I would recommend to update to RatOS 2.1. https://github.com/Rat-OS/RatOS/releases
GitHub
Releases · Rat-OS/RatOS
The preconfigured Raspberry Pi image that makes it easy to run Klipper + Moonraker + Mainsail on your printer. - Rat-OS/RatOS
did you edit any of the includes? You shouldn't have to specify
control: pid as it is already in the includes
https://github.com/Rat-OS/RatOS-configuration/blob/v2.x/templates/v-core-3-printer.template.cfg#L232Thanks @blacksmithforlife 🇺🇸 , I don't think I edited the includes. Looking at the template above it looks like
control: pid
pid_kp: 28.413
pid_ki: 1.334
pid_kd: 151.300
are all still listed under the [extruder]. Is there another place these for these?
The includes I have selected are:
[include RatOS/boards/btt-octopus-11/config.cfg]
[include RatOS/printers/v-core-3/v-core-3.cfg]
[include RatOS/homing.cfg]
[include RatOS/macros.cfg]
[include RatOS/shell-macros.cfg]
[include RatOS/printers/v-core-3/macros.cfg]
[include RatOS/printers/v-core-3/steppers.cfg]
[include RatOS/printers/v-core-3/tmc2209.cfg]
[include RatOS/printers/v-core-3/speed-limits-basic.cfg]
[include RatOS/steppers/ldo/42sth48-2504ac/2209/24v-1.1a-x.cfg]
[include RatOS/steppers/ldo/42sth48-2504ac/2209/24v-1.1a-y.cfg]
[include RatOS/steppers/ldo/42sth48-2504ac/2209/24v-1.1a-z.cfg]
[include RatOS/steppers/ldo/42sth48-2504ac/2209/24v-1.1a-z1.cfg]
[include RatOS/steppers/ldo/42sth48-2504ac/2209/24v-1.1a-z2.cfg]
[include RatOS/printers/v-core-3/500.cfg]
[include RatOS/z-probe/probe.cfg]
[include RatOS/printers/v-core-3/physical-endstop-x.cfg]
[include RatOS/printers/v-core-3/physical-endstop-y.cfg]
[include RatOS/extruders/lgx-lite.cfg]
[include RatOS/hotends/rapido.cfg]
Thank you for your help, I'm a simple UX designer and merely a hobbyist engineer 😅
I would save your current config for reference, and then copy and paste the contents from https://github.com/Rat-OS/RatOS-configuration/blob/v2.x/templates/v-core-3-printer.template.cfg into your printer.cfg. Then using your old config replace any values that need updating
@Rigattoni I upgraded to 3.1 and still no luck / same issue.
@blacksmithforlife 🇺🇸 I added the template in and updated values specific to my rig.
If I only put the sensor_type then I get the same errors that control is not specified. I've uploaded my latest printer.cfg here for reference.
[extruder]
sensor_type: PT1000
Specs:
RatRig V-Core 3.1 500
Phaetus Rapido 2 with PT1000 Thermistor
Printer.cfg for reference:
-254° means that the thermistor is not connected. If you have a spare thermistor give it a try with it.
..or may be you have a faulty cable? I would just measure the resistance.
Are you sure you sent the printer.cfg from RatOS 2.1? The attached one looks like RatOS 2.0x
yeah, don't remove anything from that template. Just update values
@Rigattoni Thanks for your help:
This is a brand new Phaetus Rapido 2 with brand new wiring, as I was replacing a Rapido 1 assuming this might be the problem, so I'm not sure if it's due to wiring
Will double check printer.cfg
This is the printer.cfg that I copy pasta'd https://github.com/Rat-OS/RatOS-configuration/blob/v2.x/templates/v-core-3-printer.template.cfg
When I simply drop it in and change from V-Core 300 to 500, I get an error:
Option 'probe_points' in section 'resonance_tester' must be specified
Once the underlying issue is corrected, use the "RESTART"
command to reload the config and restart the host software.
Printer is halted
So I modified those settings
GitHub
RatOS-configuration/templates/v-core-3-printer.template.cfg at v2.x...
The RatOS modular klipper configuration. Contribute to Rat-OS/RatOS-configuration development by creating an account on GitHub.
@blacksmithforlife 🇺🇸 would you mind specifying which values I should I update?
Previously I did not have to set up resonancetesting, but with this template it seems like I need to specify a bunch of values for it.
I'm sure I updated to RatOS 2.1
Distro: RatOS v2.1.0-RC 2 (bullseye)
But I did replace the output from configuration with the template shared above
OKay... don´t do that... that doesn´t work like that.
RatOS 2.1 has it´s own configurator. Please read the instructions on this site: https://github.com/Rat-OS/RatOS/releases
GitHub
Releases · Rat-OS/RatOS
The preconfigured Raspberry Pi image that makes it easy to run Klipper + Moonraker + Mainsail on your printer. - Rat-OS/RatOS
Don´t exchange anything, the configurator does all things you need
yeah, if you upgraded to 2.1 ignore my template stuff
Thanks @Rigattoni , I've run the Configurator with the new printer.cfg and am still getting the error 😦
heres the .cfg
Thanks, just added above
Just for some background, this issue started happening mid-print with my Phaetus 1 hotend causing the print to stop completely and these negative readings starting to appear. I replaced the hotend+thermistor with brand new wiring but the issue is persisting.
I fear that your Octopus might be defect then.
oh no lol
You may have a possibility to not buy a new board... I can see that you don´t use a toolboard.
It’s still lighting up fwiw
Yea I don't think I use a toolboard, I just used what came with base V-Core 3 500
No you have no toolboard yet. The pro to have one is, that you only have 24V and a USB cable running to the toolboard mounted at your print head. There the extruder, hotend, thermistor, endstop are connected and the communication to the Octopus is done by USB, without using the connector on the Octopus.
Would switching pins on my octopus for my thermistor be worth testing?
No there is no additional connector available for the PT1000
you need to add
sensor_type: PT1000 on line 102Ah youre right... overseen that detail
Because I use a toolboard I don´t need this line.
Tried + same issue 😦
upload new printer.cfg please
be sure to restart everything after making changes
the new cfg should be okay... even if he would not have the PT1000 it would show some temp instead of nearly 0° Kelvin
Yea, I guess that all just leaves the Octopus as the primary suspect
or the wiring. Bad crimp, internal broken wire, etc
Would that just be the wiring for the extruder? Or would other wiring issues cause this problem to? I can do a once-over on all of the wiring if that's a possibility
just the thermistors
No, just the cable from the thermistor, nothing else. If you are able to, measure the reistance on the connector of the thermistor.
You should not have an open loop.
add this to the end of you printer.cfg so you can make sure it is the extruder thermistor and not the bed one because I have seen people spin their wheels when they thought it was one and it was actually the other
Ok, when I tried doing that I get this. Should I drop the min even lower since -220 > -254?
Try 255
-255
yeah try 255. It won't let you go below 0 degrees kelvin
Yup, as it is always the same reading, he should get something now.
...and it would not be the first time that a thermistor on the hotend is doa.
printer.cfg got cut off for some reason near the bottom when I reloaded
Well, did it start up? can you see any temps now?
No issues now
other than the obvious
Still getting that massive negative read, which makes me think it's related to the connection between the Phaetus and Octopus
Here you go... it´s definitively the Hotend thermistor.
Either thermistor wiring or the thermistor port is messed up
It has to be the thermistor port I think since this is a brand new thermistor
Time to break out the multimeter
nah, I have seen bad crimps do that
Now I have an excuse to buy a multimeter
go ahead and measure the resistance
Will get back once I have a read, all I have is a crappy current detector
Thank you both for your help, I appreciate your support
you can also try using a hair dryer to see if the temp changes on the thermistor
May be you neighbor has one?
you can also plug in the bed's thermistor into the extruder port and again try using a hair dryer to see if the temp changes
that would prove the port is fine
will check, i have a buddy in construction that I'm going to see tonight
i do have a heat gun nearby
But follow first the tip from @blacksmithforlife 🇺🇸 , that ´s a really good point.
the bed is plugged in right below the thermistor if I'm not mistaken
gonna check the docs
yea its right beneath, ok gonna give it a go
you can comment out line 102 after plugging in the bed thermistor and it should read correctly
hmm like 102 seems blank to me. Do any of these seem right?
That´s okay... but now with unplugged bed thermistor Klipper will run into an issue too. So keep at least the min_temp: -255 in [heater_bed]
Ok, I've plugged the heater bed into the thermistor port (and vice-versa), and this is what I'm getting
yes, both are not the correct thermistor for them... but what we can see is, that both ports seem to be fine. It´s most probably the thermistor from the hotend which is doa.
It's strange though because I had this exact same issue with the previous thermistor which is why I replaced it
Jup... I bought 5 thermistors for my hotend and 2 have been doa
Oh wow
Alright, will send it back to them and see if I can get a replacement
Maybe with some extra thermistors for good measure
Always have one in spare... 😉 At least one...
im a moron i think
i might have forgotten to install the new thermistor
okay... 😄
checking lol
Be careful screwing in. turn the cable while screwing in to not pinch the cable in there.
Just plug in the new one to the cable and our issue should be gone
If it´s the issue, then you may have learned how to trouble shoot in future.... and a cheap multimeter is a must have. Checking the voltage of the power supply if it is really 24V or not, checking cable for issues...
Seems like the thermistor is already reassembled onto this thing
or may be missing. it said it had an easily replacable one
yes it is... and it is the newest version. Ask your buddy to measure that thing.
awesome, thanks for the sanity check
i thought for a second i'd gone this whole time without installing the thermistor
lol... that happens to me too once in a while. No problem. There need only some phone call to be disturbed and when you come back to your parts you may forget to finish this simple step...
You may keep us updated about the resistance of this thermistor. Would be interesting at least. And may be heaten it up while testing and the resistance should change.
yes will definitely keep you both informed
ah one thing to mention when you change the thermistor... You need to add a lot of thermal paste as you can see how it is installed now. This is mandatory to get correct temps.
Thermal paste which is heat resistant up to 350°
@Rigattoni @blacksmithforlife
Here’s a video of using the multimeter set at 20k on the thermistor wiring
Sorry for the heavy breathing haha… was propping the phone up under my chin to record
Seems like there is a reading, but it shoots back down to zero after a moment
please lmk if this seems unusual or if there's something else I should be doing
This is a classical short...
So it´s a broken thermistor.
Is there any possibility that my printer caused the short @Rigattoni ?
No, I don´t think so.
BTW: A PT 1000 should show something like 1kOhm at 25°C. If it´s just zero means that the cable is shorten.
Solution
Thank you for your help @Rigattoni and @blacksmithforlife 🇺🇸 it was the thermistor or wiring, but either way we are operational again 🙂
And upgraded to a volcano/reprinted some precarious parts as well 😅
Solved