Is "after market" FEP thinner, than original FEP film that comes with printer?
That first original FEP film lasted 4 months and had 0 bumps/lumps, but it did have some groves and other imperfections, so when i had trouble with prints i replaced it with another FEP film (2 pack from prusa page). With first first print (with new film) there was small bump/lump about 5 mm diameter. With 4th print, there was another large bump/lump about 1 cm diameter (in different place), so i had to change to film again. With first lump there was nothing stuck to it, with second larger one, there was a piece attached to film, so that is what stretched it out more and more until it was this quite massive lump. (did Calibrated it after first FEP film change)
Why does it stretch out like that so easily, when first original film did not stretch?
I see, that the FEP film on Prusa page ( 3 pack) is 150 microns. Was 2 pack also 150? How much was original film? Where do you get your FEP film? 200 microns sound better, when 150 stretches so easily...