Prusa3D Forum - Recent Topics

Bed thermistor error after switching to 6.5.3

Lordran_Hollow — Fri, 01 May 2026 12:26:34 +0000

Hey all, just wanted to see if anyone else is encountering this issue I'm having. If I set the bed temperature manually to heat up to a specific temp (in this case I'm setting to 100C), the printer will throw a thermal runaway error citing the bed thermistor.

Now here's the thing, if I print and the bed heats up to this temp, it's perfectly fine. Even after hours of printing. The manual heat up method throws the error within a minute.

I print with ABS and I like setting the bed temp so that the chamber has time to soak up the heat since my enclosure is passively heated. It's not the end of the world that this issue is happening, but I was curious if anyone else has started experiencing this issue after upgrading the firmware.

The full setup is a Mk4, with 6.5.3 firmware, and an MMU3.

HorribleAppleUpdate

Spiffy Wolf — Fri, 01 May 2026 12:19:31 +0000

Your site will not let me create a help desk ticket I have the language prompt that will not leave the page and I cannot move from there BTW Give some instructions on how to update apple as your 'path' sucks...../Give me a link I can click and not the git hub bs.apple page still shows 2.4 Why not give updates thru Apple????

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Sretching sound after replacing Revo 6 with another Revo 6. What causes that?

heinzight — Fri, 01 May 2026 04:27:14 +0000

Had the Revo 6 on my MK3S for several months, with beautiful results. Swapped the .4 nozzle for a .25 and began to print. DON'T DO THAT! At least in my case I should have gone through calibrations first as I now have a 'groovy' design on my build plate and it bent the Revo. Ordered and installed new one and powered up. MMU2 spindle revolved but when the head began to move a loud squeely scretch bellowed out. What was that and what could have caused it?

Bad Thermistor in Hotend?

Job — Thu, 30 Apr 2026 20:13:16 +0000

When I start up my MK4 the live temperature reading for the hot end reads around 22o °C, while the hot end is room temperature and it stays room temp when I attempt to preheat the system for printing with PETG.

Is this a bad thermistor that needs to be replaced or is there some other trouble shooting I can attempt? This is pre-built system less than year old.

Calibration data seems lost FW 1.8.0

YZ — Thu, 30 Apr 2026 19:46:26 +0000

Hi
I made SL1S calibration using the printer wizard.
I printed a test model and the result was great.
I took out USB drive to my pc and copy another model.
When i come back to the printer the power was off (maybe asome Time Out) so i press the front button and the printer went ON.
I put the USB drive it the printer and stated to print the new model.
The printer start hitting the platform against the bottom of the tank and made a lot of knocking noise. It seems that it is not calibrated at all.
I stop the print and use calibrate wizard again. I noticed that the Tilt start value wasnt as i set it up in the last calibration procedure. So i calibrate again and print with no problem/
It happened to me after every print, after power shut down.
Why the calibration data lost?
Any knowladge or solution for that?
Thanks