PET damaged PEI on a new sheet
I printed with PET (Nebula PET-G) on a new PEI sheet from Prusa. I removed parts by flexing a cold bed, and one of them broke off with a piece of PEI from the bed. I printed a lot of PET on my other Prusa and never had this issue (although another PET-G filament). Could it be some faulty PEI sheet? I bought it with a printer in may this year.
Print settings: 230/80 deg., smooth PEI sheet, no glue, cleaned with acetone beforehand. Removed cold from sheet.
RE:
The Prusa materials table https://help.prusa3d.com/materials clearly says use glue stuck with PETG on the smooth sheet, so I don't think you have any recourse here.
If you buy a new sheet I'd suggest you consider the satin sheet. Everything I've thrown at it, it has handled with ease. No need for glue stick with PETG, it lays down easily and pops right off when cooled down.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: PET damaged PEI on a new sheet
I suggest not to try to kill the sheet dead with acetone. Acetone will make the sheet´s surface brittle and will get you where you arrived already, sorry to say.
I try to give answers to the best of my ability, but I am not a 3D printing pro by any means, and anything you do you do at your own risk. BTW: I have no food for…
RE: PET damaged PEI on a new sheet
Funnily I cannot get Prusa PETG to stick to the satin sheet and use the PEI sheet for that purpose....
I try to give answers to the best of my ability, but I am not a 3D printing pro by any means, and anything you do you do at your own risk. BTW: I have no food for…
RE: PET damaged PEI on a new sheet
I learned the hard way, when first using the PEI build plates, to always use a release agent. I was used to glass plates. I had an ABS print with a large lower surface area and I got impatient and used a metal kitchen implement to pry it loose from the plate. A few chunks of the PEI coating came off with the print.
Since then I've always used a release agent, usually Layerneer, sometimes glue stick, when printing ABS or PETg.
Yes, PETg can indeed stick too well to the PEI coating.
Now a couple of years after the first issue, I had another case where an ABS print pulled off a much larger piece of the PEI coating, but this WAS when using Layerneer. (below)
This was a well-used PEI build plate and I attributed the damage to age of the plate, usage, wear and tear, etc.
I did successfully re-skin this plate, and wrote it up here: https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/re-skinning-a-prusa-steel-build-plate/ It's an exercise in masochism and I would not recommend it.
