PETG permanently adhered to textured PEI sheet?
Has anyone run into this failure mode before? I was printing an octagonal first layer to dial in my z offset and I came back to what looked like a bubble underneath. I thought it hadn't stuck to the sheet but it's just the opposite, the PETG completely fused with the plate in that spot. Already ordered a new one because it ain't coming off. Curious if anyone else has run into this since my Googling didn't seem to indicate it was a problem: 
RE: PETG permanently adhered to textured PEI sheet?
try dribbling IPA around the patch, let it soak a while, then try gently removing the patch again.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: PETG permanently adhered to textured PEI sheet?
This actually helped a bit! I was able to get more of a chunk off but there's still some debris around the edges. Probably still a goner bit it did help get some up.
RE: PETG permanently adhered to textured PEI sheet?
try putting the build placte in the freezer for 5 minutes, and try removing again. if it still doesn't release, offset a small test print so it doesn't clash with the patch, , then print the test print, hopefully the blob will not interfere with Mesh bed levelling, a
and when you finish the test print let the build plate cool naturally, then try removing with IPA again.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: PETG permanently adhered to textured PEI sheet?
I'll give that a shot, do you have any idea why this happens? PEI coating breaking down maybe?
RE: PETG permanently adhered to textured PEI sheet?
too much adhesion... perhaps...
https://blog.prusa3d.com/how-to-print-on-a-powder-coated-sheet_30178/
Regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK