PEI has lumps after removing printed objects from heatbed
I printed a 9 piece puzzle today with no problems, and removed the pieces with a putty knife with no sharp corners, as usual. All the pieces were stuck pretty tight, but popped loose when I hit them on the bottom edges/corners with the putty knife.
Upon removing the pieces, I saw that the PEI had lifted and formed bumps/hills at almost every corner of every piece. Now the bed is not perfectly flat. The bumps are all about 4-5mm in diameter.
I heated the bed and tried to smooth out the bumps by rubbing a cloth over them with a fair amount of finger pressure, but the bumps did not entirely go away.
Has anyone experienced this? Do I need a new PEI sheet? How can I prevent this from happening again?
I've only had my i3 kit less than a month.
Re: PEI has lumps after removing printed objects from heatbed
I should have mentioned that the filament was Prusa PLA at 205 deg, bed at 55 deg, and I didn't see any issues with either temperature for the whole print (~9 hours).
Re: PEI has lumps after removing printed objects from heatbed
😕 💡
there are several posts here, where people are concerned about it. for example this one.
the PEI sheet itself still is ok, but the marks/blisters/lumps are a thermal reaction of the 3M adhesive between heatbed and PEI.
➡ usually the "lumps" go away after some hours/days and several heating cycles, so no need to worry about it.
dem inscheniör is' nix zu schwör...
Re: PEI has lumps after removing printed objects from heatbed
Thanks for the info. I've noticed the lumps have gone down considerably overnight. The sheet is almost flat again.
Re: PEI has lumps after removing printed objects from heatbed
I found the same thing and have begun to let prints sit until cooled completely hoping to let everything stabilize. Seems to be ok.