Printing the Bambu PETG from the drier helped a little. There were fewer blobs and artifacts after re-drying, and I got the last of the spool to print. So I switched to a white Overture PETG that has really been a nightmare to print with. It produced several failed prints in a row. Specifically, it does not stick to itself when printing infill, and it especially fails to stick when printing the transition layers of support structures. This leads to a lot of strings, loose blobs and lumps in the print. Usually this cascades into a failure. The surface of the part actually looks a bit chalky and dull, even though I am printing near the high end of the recommended range. I tried adjusting support and infill settings, but after the forth failure I gave up and switched to a roll of eSUN’s new high speed PETG that I wanted to test…
I loaded it, set the generic PETG profile, bumped the max flow up a bit to 15, and set the temps to what was recommended on the spool. I also did a manual flow calibration, then I printed a part with lots of infill and support that was giving me all the problems and…
it produced the most beautiful and perfect PETG print I have ever seen! The quality rivals anything my printer has produced with PLA. Not a spec, smudge, blob, or string to be seen anywhere. Not only that, but this is printing faster than any other PETG I have used, and I haven’t found the limit.