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3DPrinting
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Yep, you should be able to reach 290C or so with a bimetallic/titanium heat break and a hardened nozzle. Also, turn off the fan when printing with PETG and print at a lower temperature. 255C is WAY higher than PETG needs, and you're likely needing that extra temp because you haven't turned the fan off.
The fan is indeed going. I'll go print another temp tower with the fan off, thanks for the advice.
The suggested printing temp on the spool does say 230-255, so thought nothing more to it.