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PEI sheet to improve adherence

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First of all, I do have to say that I've never tried PEI before, but I have heard a lot of great things about it, and if I were in your shoes, I would definitely go for it.

Also before getting to what I've read, here is a video that I find useful. It goes over many types of build surfaces:

Okay, so just like a summary of what I know, PEI is incredibly good for bed adhesion when heated. The Prusa i3 Mk2 and the Lulzbots use it, and overall, it seems to be the "miracle surface" that works better than practically everything else out there: blue tape, kapton tape, abs slurry, glue, etc. I mean, if Alephobjects uses it for all of the Lulzbots, it should mean that it works consistently for something like ABS and probably polycarbonate as well.

However, just a friendly word of caution: you don't want a sheet too thick, but on the other hand, thin sheets will be more difficult to apply.

Hope that helped!

nerdwarrior

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I just got a few spare sheets of PEI delivered from the Prusa shop (and some i3 attached to one of them) and found these fit the glass plate of my UM2+ nicely with only a tiny bit of cutting required (~ 2 mm on one side, plus round the edges a bit).

Dimensions of the Prusa i3 sheet: 254x224 mm, 175μm with 3M 200MP adhesive

Price for us Europeans is fair enough at roughly 9 Euros, but s&h costs are a bit steep.

So far I only printed with PLA, but it looks promising. I stuck it on a original UM2+ glass plate that was annoyingly uneven and so far, things are looking pretty good. I got some ABS, Filaflex, PLAtec and Woodfill waiting to be tested next.

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