It sounds like you are experiencing some unexpected results with PETG compared to PLA. Here are a few troubleshooting tips:
Increase the nozzle temperature: Since you tried both 255 and 270, try incrementally increasing the temperature by 5-10 degrees to see if it improves layer adhesion and part strength.
Slow down the print speed: PETG generally benefits from slower print speeds compared to PLA. Try reducing your print speed to see if it helps with layer bonding.
Adjust the cooling fan: PETG typically doesn't require as much cooling as PLA. Try reducing the fan speed even further or turning it off completely to see if it improves the print quality.
Check your print bed leveling: Make sure your print bed is leveled properly to ensure good adhesion and prevent warping, which can impact the strength of the part.
Experiment with different layer heights: Trying different layer heights can also impact the strength and flexibility of your printed part.
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