PETG is truly a pain!! You'd think with a plastic used in water bottles, it would do better with moisture. I recommend the brand CC3D if you want something reliable (and ultra cheap!) Also remember that PETG needs more room between the nozzle and the build plate (higher z offset) so that the filament doesn't stick to the nozzle and make a mess :)
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Think about what happens to water if it's heated above 100C... it turns into steam! The more water there is in the plastic the more steam there will be, causing the various issues like bubbling. The release of steam also means some of the heat is not being absorbed by the filament, leading to temperature issues as it exits the nozzle
You're starting to make me think that my own PETG issues may be due to more than my laziness about fine-tuning after all. Time to break out the dryer (which I've previously only used with PVB, another one of those highly hygroscopic materials).
Good luck to you! Let us know if it works out. (If not, just keep that to yourself!)