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No hotend upgrade is required to print PETG on an Ender 3 (pro or any other variant). The stock hotend can be used at temperatures up to 250 ˚C, and 230-245 ˚C is the range typically recommended for PETG. I print it at 245 ˚C. You may however want to upgrade the extruder. The stock extruder lacks both torque and grip, and significantly skips/slips when ...

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