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Headbed "bumps" after printing PETG  

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johnny
(@johnny)
New Member
Headbed "bumps" after printing PETG

Hi.

 

We have printed a quite little squared box with PETG for the first time and it has somehow destroyed the headbed.

The 4 corners of the box has left some bumps on the plate and the surface has been crackled. The rest of the box (has covered the full area between the 4 corners) has left no damages in the printed area - only on the corners.

We followed the settings in Prusa for PETG prints with temperatures etc. The fillament was PETG from dasfilament.

Any idea why it's been damaged?

 

Posted : 25/09/2019 7:25 am
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(@)
Illustrious Member
RE: Headbed "bumps" after printing PETG

They go away with time; but are a reminder to add a release agent when printing PETG on the smooth PEI sheets.

Posted : 25/09/2019 7:31 am
johnny
(@johnny)
New Member
Topic starter answered:
RE: Headbed "bumps" after printing PETG

@tim-m30

Thanks for quick reply. Quite new with Prusa printers - what do you mean with "release agent"?

Posted : 25/09/2019 7:33 am
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(@)
Illustrious Member
RE: Headbed "bumps" after printing PETG

PETG sticks too well to the PEI, so you need to use something to aide releasing the part.  Most use Windex - spritz some on the bed, wipe it into an even layer, let it dry (don't wipe it dry, leave a thick layer to evaporate). 

But you are on your way to using finger prints, too.  They'll help the PETG to not stick, and will make printing PLA a challenge, too.

Posted : 25/09/2019 8:33 am
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