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Hotspots (or coldspots) on HeatBed  

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Jon M
(@jon-m-2)
Active Member
Hotspots (or coldspots) on HeatBed

I have been noting that the corners on larger prints appear warped with uneven thickness.  What causes this and how to fix it?

Posted : 30/09/2021 2:47 am
AndrewTerry
(@andrewterry)
Eminent Member
Brim?

I haven't had too many warping problems with PLA, but PETG was troublesome for me... no matter what I tried, a large, square print suffered with corners lifting.

This thread was a help - inconsistent airflow/tempertature around the print seems to be a big factor: https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-how-do-i-print-this-printing-help/petg-corner-lifting/

As the thread states, putting the printer in an enclosure is the ideal fix. This wasn't pratical for me, but adding a Brim in the slicer fixed the problem I was having. Might be worth a try?

Posted : 30/09/2021 9:23 am
jsw
 jsw
(@jsw)
Noble Member
Posted by: @jon-m-2

I have been noting that the corners on larger prints appear warped with uneven thickness.  What causes this and how to fix it?

If you don't have an enclosure, you might try the 'draft shield' option, available in both PS and Cura.

Posted : 30/09/2021 11:20 am
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Brim?

What could help against warping: Operate the printer in an enclosure and heat up the printing plate for about 20 minutes before printing so that the heat is well circulated. Deactivate fans if possible. Avoid drafts. Brim and mouse ears on the corners are also helpful.

wbr,

Karl

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 30/09/2021 12:03 pm
jsw
 jsw
(@jsw)
Noble Member

Actually, that (preheating) is part of my SOP for printing most ABS prints.  I let the thing get up to temperature and stable for 15-20 minutes before launching the print.

I also use Layerneer with ABS prints, as it acts both as an adhesion booster (will help with warping/corner pull-up) and as a release agent.

Posted : 30/09/2021 2:00 pm
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