When i played with PETG i didn't have much for bubbling issues except maybe the first piece. i kept the heat gun on low and used distance away from the gun to control the temperature further. Even and spread out heat.
I did have some leaks in my external cooler though there was a bit too much force on some of the rotary fittings so I reverted it back to soft tubing inside the cooler and left the hardline only in the computer itself.
Hardware Canucks is focused in-depth reviews of the the latest graphics cards, CPUs, storage, smartphones, notebooks and gaming peripherals. Join us as we unbox, review and benchmark the best computer hardware on the market.