When I start a print, after it homes the toolhead, where the nozzle temp is at 140, it goes to loading filament stage and the nozzle temp goes to 141, maybe 142 and stops.
If I wait nothing happens, when I cancel the print, the temperature will have to come back down from something higher than 140, depending on when I stopped it. If I start another print of the same thing, it works normally.
I’ve changed the filament, changed the nozzle, ran a calibration, cleaned the copper sensor behind the nozzle. None of that made a difference.
I got the printer around mid November 2024, and have been printing quite a bit on it.
Has anyone seen this or a similar issue, and possibly have a fix for it?
Is this behaviour new or could you have just noticed behaviours you previously had not watched carefully?
The nozzle will heat to 140º during the start-up, cleaning and bed-levelling stage.
It will then go to the correct temperature needed to load the filament and back down again, before eventually going to the print temp.
This is because different parts of the start-up process require the hot end to be at several temperatures.
Have you left it to complete the process before and try printing?
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This is relatively new, it started happening about a week or so ago.
When I start a print, it does the cleaning and homing stage, then when it gets to the load filament stage, that is when the temp, which has at 140 for the homing stage, will go up 1 or 2 degrees and stop.
I tried waiting for about 30 minutes before canceling the print. When I did that, the nozzle temp was at 141 before canceling and then jumped to 250, and started coming down.
And I forgot to mention in my original post that I have restarted the printer multiple times.
Try printing this model from Bambu Studio.
This is a single-colour version [n of one of my models.
It is a fast print, just 30 minutes.
- When you have it in Bambu Studio, change the printer to yours (the top left of the screen when in the prepare tab).
- Slice it and send it to the printer.
See if this does anything different to your description.
One other thought, does your printer name (same place as noted a minute ago) have an asterisk in the name?
Maybe a problem with the ceramic heater on the hot end popping off of the thermal paste?
I will give this a go and let you know. It will probably be a few hours before I can get to it though.
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The printer name does not have an asterisk in it.
I rebooted the printer, then started your print, and it started printing normally.
The nozzle temperature worked as expected.
Is there a setting I should be checking in each file I print. I’ve been leaving them at the defaults so far.
The good news is we have ruled out your printer being at fault.
It is possibly something simple, we just need to figure it out.
Test time.
- Open Bambu Studio
- Create a new project if one already exists
- Move to the Prepare Tab
- Right-click the build plate and add a Primitive - Cube
- Change the size of the new cube using the toolbar options, something small like 20x20x20mm.
- Make sure you have selected your printer (top left of the screen)
- Slice
This is a test designed to use everything you created.
If you see any Asterisks in the printer name, open the printer settings window and look for settings with different colours, it indicates settings have been changed. Screenshot that and send it back.
The issue returned.
After I chose Print, it homed the toolhead, then got stuck on filament loading saying the nozzle was at 116 degrees.
I waited 15 minutes and it was the same. I canceled the print and the temp jumped to 171, then to 226. And then cooled down from there.
Here are the settings:
Just before canceling
Just after canceling
I opened a ticket and Bambu Lab sent me a Tool Head board and USB-C cable and that fixed it.
What was the USB C cable for
It connects the tool head to the main board. #9 in this image.
At one point the cable drooped down and the tool head ran over it, and possibly damaged it.
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