troubleshoot with different 'first' and 'other' layer bed temperature selection
Good morning,
my printer crashes on 'thermal runaway' when 2 different bed temperatures are selected for the first and other layers. Looks like the filament temperature drops down at the moment the bed temperature is changed!
Did someone experienced the same?
Many thanks for your feed backs
RE: troubleshoot with different 'first' and 'other' layer bed temperature selection
Are you printing PLA ? Its far more likely to be the print fan kicking in at layer 2 that is causing a drop in temperature which the printer is interpreting as an error. To see if it is you can set the fan to de disabled for the first 2-3 layers instead of only on layer one (its under filament settings). If it doesnt give a thermal runaway on layer 2 then you know its not the set temperatures.
If the fan is causing such a big drop then you will then have to investigate why.
RE: troubleshoot with different 'first' and 'other' layer bed temperature selection
@neophyl
Many thanks for the quick reply! starting the fan at the third layer seems to solve the problem! I ll do a few more checks and report here if necessary
NB: I indeed use PLA for electronic boxes. The first layer at 70C gives satisfactory results, then I reduce the temp to 60C.
RE: troubleshoot with different 'first' and 'other' layer bed temperature selection
One thing that many use is a silicone sock around the hot end. This has a few benefits, it stops the fan lowering the hotend temp (doesnt help with bed temp though). It also reduces any issues/cleanup if you do get a detached print that results in a blob of doom'. If you fit one to your hotend then remember to do a PID tune to take the new thermal profile into account.
RE: troubleshoot with different 'first' and 'other' layer bed temperature selection
@neophyl
Sorry to jump in on your thread Oliver
Neophyl, do you mind if I ask a few questions.
Is it recommended to run the PID adjust on a new MK3S+ kit? I saw there was a print out with the kit detailing heat curves for the hot end and bed, and assumed it had been already ran?
Should I add a silicone sock to my hotend, is there any reason why this is not supplied with the MK3?
Tank you very much!
RE: troubleshoot with different 'first' and 'other' layer bed temperature selection
as far as I know the printers have already had PID run on the hotends and beds so shouldn't be needed again unless you change something in the hardware. Any time you change a thermistor or a heater element for example is a hardware change.
That being said it doesn't hurt things to rerun a PID routine. I run them when ever I disassemble/rebuild the hotend too even if I haven't changed the hardware. I treat it like any other part of the calibration process.
RE: troubleshoot with different 'first' and 'other' layer bed temperature selection
@neophyl
Thank you very much.
Makes sense.
Whats your opinion on adding a sock, any idea why Prusa dont supply one, they seem standard on most 3d printers?
Tank you very much!
RE: troubleshoot with different 'first' and 'other' layer bed temperature selection
How to run a PID tune?
RE: troubleshoot with different 'first' and 'other' layer bed temperature selection
https://help.prusa3d.com/en/article/pid-tuning_2265
Tank you very much!