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endor640650dWe really need standardized materials for 3d printing, instead of every ~motherfuck~manufacturer making their own custom shit.
Kinda like with metals, where the most common alloys follow international standards and always have the same properties, no matter where they're made.
qwwerty58649dWe've printed all parts during MK2->MK3 upgrade from provided Prusament and haven't seen such issues. (PETG not PLA though)
You might have to tune not only the hotend temperature but also cooling and material flow. Temp tower and fitting test might help with that.