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Hi, I am using Kossel Pulley (not plus) and printing PETG without issues yet. It does warp a little if I don't use my heated bed, but now I have one, no problems anymore. I never noticed PETG build up on the nozzle, but I did not print longer things than Benchy at 40mm/s.
By the way, it came out way better than PLA versions oddly.