I’ve experienced the ‘shrinking’ too on my 2nd roll of preconfilter 80micron. Came to find out the ‘clean’ side of my roll wasn’t screwed in tighter (sandwiched better between) to the two red motor end gears, which caused the motor to not advance correctly, which then caused the fleece to stretch when advancing after 8-9”, causing the holes to be exposed. I finally took everything apart and found out that the clean side fleece gears weren’t on tight (loosened over time?). After noticing that and making sure its install tightly after every fleece change, the last 3 additional rolls usage, has worked great. Will order more shortly from preconfilters.