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Yeah I think you need a new build surface, friend.
How expensive are they?
As cheap as $2 from Ikea for a mirror or roughly $15 for a PEI sheet. Print surfaces are consumables like nozzles or filament.
This print bed has seen better days but doesn't need to be replaced right now.
Btw. Using PETG on glass or Creality glass surfaces is a great way to destroy them in a timely manner.
This is very informative thanks. I've printed a lot of PLA on my Creality glass plate with no issues, but I recently started with PETG and it's insane how much harder it sticks.
I learned through trial and error to only remove it while the bed is still hot, but even then it really sticks too well.
Not too bad, here it is on their website