So my original Ender 3 bed had too many dents and it was time to replace it. I picked the cheapest 3 pack I could find on Amazon with premium shipping and crossed my fingers for expecting the worst. But adhesion on these things has been excellent so far. I print with PETG and on a standard PEI surface it took me 70 degrees Celsius to get adequate adhesion and after printing the parts could be removed from the platform by hand. With this surface I print at 40 degrees Celsius and have to use a scraper to separate the details. Next I will try not to heat the bed at all. I've done a dozen prints so far and it's been consistent. FYI, the glue on these things is incredibly sticky. After removing the old PEI film and cleaning the surface of the bed, you only have one chance to put this thing down. If touched even a small stain, it will be difficult for you to remove the sheet. I also have a cheap rubber bridle that I use to hold the sheet down to the surface of the bed.
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