kris.f
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After several successful prints, I can't recalibrate my MK3

Feb 18, 2019 5:32 am

I assembled my kit and was able to get it configured. I used the calibration 75x75 sheet to figure out my Live-Z setting and I had it dialed in. Printed several 1 hour - 4 hour sample prints that all came out great.

Then I tried a 36 hour print and 23-24 hours in, I had a birds nest. Ever since that birds nest I can't get anything to print well. I don't know where to begin to figure it out. I've printed out several of the test sheets and wrote the Live-Z setting on it. The .900 seems to be the best, but still bad. My first attempt at configuring my sample print left me with a perfect sheet once I finalized the correct Z-setting.

Please tell me where I need to look to figure out how to get the printer printing well again. Thanks!
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tim.m30
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Re: After several successful prints, I can't recalibrate my MK3

Feb 19, 2019 10:06 pm

-0.875 would be my pick.

It's really hard to say; but a prime reason for print failure is poor bed adhesion. And 99% of the time that's due to contamination on the bed. When was the last time you soap and water washed the bed, that is, the PEI sheet?

kris.f
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Re: After several successful prints, I can't recalibrate my MK3

Feb 20, 2019 12:08 am

I'm pretty diligent about alcohol after every print. I'll do soap and water tonight and try a full sheet at .875 tomorrow and update. Thanks.

vintagepc
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Re: After several successful prints, I can't recalibrate my MK3

Feb 20, 2019 12:33 am

Hard to tell from the pics but some of that looks like under extrusion or a partial clog, since I can't really see any balled-up stuff indicating the missing bits are from poor adhesion.

Couldn't hurt to also do a cold pull on your filament to remove any gunk in the extruder that might have cooked. Could also be the cause of the birds-nest if your print lost a layer or two as a result.

kris.f
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Re: After several successful prints, I can't recalibrate my MK3

Feb 22, 2019 1:33 am

I'm still not getting good prints. I don't know how to diagnose this thing.
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toaf
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Re: After several successful prints, I can't recalibrate my MK3

Feb 22, 2019 2:05 am

did you try recalibrating the Z (motor goes all the way to the top) wonder if something happened and it got your Z motors off from eachother.
I have a Prusa,
therefore I research.

thanks,
chris

david.t28
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Re: After several successful prints, I can't recalibrate my MK3

Feb 22, 2019 2:52 am

I had an issue not too long ago where I reloaded the firmware to the printer and fixed a problem. One day it was working fine and the next couldn't print to the bed.

I downloaded a large one layer/first layer print object. You start the print and adjust live Z while it's printing.

kris.f
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Re: After several successful prints, I can't recalibrate my MK3

Feb 25, 2019 2:41 am

Still the same issues. I can't get a clean calibration sheet.

kris.f
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Re: After several successful prints, I can't recalibrate my MK3

Feb 25, 2019 2:42 am

toaf wrote:
Feb 22, 2019 2:05 am
did you try recalibrating the Z (motor goes all the way to the top) wonder if something happened and it got your Z motors off from eachother.
Yes, I did the full calibration wizard. What are the resources I can use to try to fix this? Does Prusa have a tech support number?

Thanks.

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