well the roll I'm using has been hanging around in my workshop since last year.
I did open the vacumn pouch.
But I generally don't have mositure issues anyway. once it's been opened most of my filament is just stacked up on shelves. While it does rain alot in england - we don't tend to have high humidity that often.

And yeah next time i play with it I'll put the z-gap right up.

I'm also starting to suspect that this particular PEI is menat for printers without heated beds.

I've started making some pasta extrusion plates for my hand cranked mincer/grinder.
Even at at 50c the pet-g only came off the plate after heating the plate back up and eventually getting a metal scraper under one part.

Ended up making the first one out of pla anyway.

But absoilutely no stringing, prints fast, I've had the cooling fans full on from layer 2 on.
So whether it's just this particular brand (whihc no longer appears to exist) I don't know.

I do have some transparent pet (no glycol). So I'll have a play with that.

I'm also thinking - maybe polycarbonate might stick to this stuff.
So that's probably what I'll play with to0night.
The hot end is supposed to be good for up to 260c - though I have noted the official config file has max set to 290c and the one I'm using has it set to 285.

So we'll see - if it goes up in smoke - I'll know better for next time lol