Does a PEI plate wear out? My original smooth plate appears to be in good condition, but I am having increasing trouble with adhesion. Over time, I have to do more and more to get a good first layer stick even on PLA. I’ve cleaned with distilled water, and isopropyl alcohol. I started using glue and increasing my build plate temperature (60c), but that all seems a bit extreme for PLA.
Does the PEI coating wear out and is there a good way to tell when a plate has gone bad?
I can’t say if the coating wears out but once in awhile give it a good scrub with dawn dish soap and hot water see if that helps. Haven’t had any issues using a textured build plate. Not sure about the smooth one.
Short answer is yes, you can clean its or use steel wool to rougher that could also work.
I have enough “worn out” build plates over the years to say, categorically: yes - but not in the way most people think.
PEI gets its usefulness from two main properties. When it is hot, its surface energy increases, which makes it very sticky to molten filament. When it cools, the surface energy drops and the PEI and printed part contract slightly, which helps break that bond and allows the part to release.
Where people get misled is with textured PEI in particular. It can be damaged at a microscopic level that you cannot see with the naked eye. All you experience is that a plate that used to stick well no longer does.
For example, using abrasive cleaning pads like green 3M scrubbers can effectively polish down the tiny peaks and valleys that textured PEI relies on for mechanical grip. Using the wrong cleaning agents can also leave microscopic residue in those same features, forming a barrier that interferes with adhesion.
In those cases, the plate did not really “wear out” from printing - it was gradually damaged or contaminated, which just looks like wear in day-to-day use.
@jimandyen @Barry @JoeFriday This makes sense. Thank you all so much. extra kudos to Joe Friday for really getting into the details. It really helps to understand the “why” of it all.