I’ve had a MK4S for over a week now, and 100% of the prints I’ve tried to make on the textured sheets have partially or totally failed. PLA prints beautifully on the smooth sheet, but PLA, PETG and ABS, I think I could print on the surface of a 10 inch tank of oil with more success than the textured sheet. Plastic doesn’t stick to it. I’ve wiped it with isopopyl, I’ve washed it with dawn…it’s a bad print surface and I want my money back.
Per Prusa’s Knowledge Base I washed it with “warm water (not hot!) and a few drops of liquid dish soap (not hand soap).”
I’ll go get out my canning pot, boil up 5 gallons of water, and scrub it with a brillo pad and some brakleen. Can’t fuck it up any worse than Josef himself did.