Selftest - Heatbed failed - help needed
Just build my first MK4, after selftest I got "Failed result"
Failed is the part with headbed heating, - I noticed it want to heat it up to 110celsius, but heat it quite slowly - and heat it up to 60-65 celsius during the test - meaning test fails.
Any helps what I did wrong, or what should I check?
The bed is heating for sure, but for some reason not as quick as test wants.
RE: Selftest - Heatbed failed - help needed
A stupid question from my side. Have you tried the self-test a second time? Did it fail again and reach exactly the same temperature as before (60-65°C)?
Mk3s MMU2s, Voron 0.1, Voron 2.4
RE:
Yep, I run it multiple times, the same result - the test is heating heatbed, but not quick enough to get 110celsius, and ends with fail, temperature vary (but usually between 60-70 celsius)
A stupid question from my side. Have you tried the self-test a second time? Did it fail again and reach exactly the same temperature as before (60-65°C)?
RE: Selftest - Heatbed failed - help needed
Odd. Maybe someone else knows more but I would stop the time, how long it is actually trying to heat, until it skips, and then contact Prusa Live chat about that issue.
Mk3s MMU2s, Voron 0.1, Voron 2.4
RE: Selftest - Heatbed failed - help needed
I don't know if this is the first time you assembled a printer and how much experience you have in this subject, so forgive me if this sounds like a silly question. 🙂
Did you check that all wire connections between PSU, electronics box and heat bed were made exactly as shown in the instructions, that they are secure and have good contact?
I remember a posting where somebody attached the wires to the wrong side of the heat bed and the connector cover deformed because of the heat caused by the bad contact.
RE: Selftest - Heatbed failed - help needed
Hi MartinD,
Which steel sheet did you use for calibration/selftest ?
Ive got the same ettot with the textured sheet ... but when I swapped to the smooth sheet the calibration worked like a charm.
Tested several times: With textured sheets i had 6 fails out of 6 tests.
With smooth sheet 4 out of 4 sucessfull tests.
Seems that the textured sheet has slihltly different thermal capacity - and my MK4 couldnt handle the difference
Just build my first MK4, after selftest I got "Failed result"
Failed is the part with headbed heating, - I noticed it want to heat it up to 110celsius, but heat it quite slowly - and heat it up to 60-65 celsius during the test - meaning test fails.Any helps what I did wrong, or what should I check?
The bed is heating for sure, but for some reason not as quick as test wants.
RE: Selftest - Heatbed failed - help needed
Can confirm that..
Textured sheet - Multiple fails
Satin sheet - Failed
Smooth sheet - Passed on 1st try
RE: Selftest - Heatbed failed - help needed
I can confirm…
No sheet - failed
Smooth sheet - pass
Unacceptable for Prusa to not make this clear. Hours wasted…
RE: Selftest - Heatbed failed - help needed
This Worked
RE: Selftest - Heatbed failed - help needed
I can confirm…
No sheet - failed
Smooth sheet - pass
Unacceptable for Prusa to not make this clear. Hours wasted…
Glad I found this thread, was changing nozzle so took the sheet off and had constant fails, i usually do a check just in case, with a sheet it passed, not sure why this is not part of instructions of calibration... thankfully i came across this thread 30 minuts after driving myself nuts with the issue.
RE: Selftest - Heatbed failed - help needed
My experience may be of some value.
I had several failures with texture sheet and no sheet at all. Turned off the LED light bar ( https://www.printables.com/model/3267-led-light-bar-prusa-i3-mk2mk3) and the test passed. Maybe just a coincidence.
RE: Selftest - Heatbed failed - help needed
Thank you XSImnl and Nick
This worked saved me a lot of headaches
RE: Selftest - Heatbed failed - help needed
Unfortunately, I get the same result no matter which sheet I use. Does anyone know what the test is looking for as the pass/fail criteria? Rise rate? Final temperature? Prusa support just told me to skip it and try to print (which works fine), but I need to get rid of this calibration nag warning.