Have you started by printing a temperature tower and retraction towers (distance and speed)? That would be a good first step.
I've recently played with settings for PETG in Cura and have it dialed in pretty well for my Anycubic I3 Mega (with a Bowden extruder). I can't remember everything I tried, but I'll go through the settings I can remember. Your mileage will almost certainly vary.
Finding the right temperature and retraction settings helped.
Printing Temperature: 250 C
Retraction Distance: 6.0 mm
Retraction Speed: 40 mm/s
Speed seemed to play a part in it for me - specifically, printing slowly. It's agonizing, but it works.
Print Speed: 40 mm/s
Outer Wall Speed: 30 mm/s
Playing around with combing also seemed to help. Specifically, the following settings:
Combing Mode: "Within Infill"
Max Comb Distance Without Retract: 8.0 mm
I hope some of that helps.
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arj3090 2
I'm running my first test of Ultimaker PETG. The temperature is 240 with a 0.4 nozzleand so far it looks good.
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