PSA: Sunlu Petg-G — avoid like the plague
I've printed many kilograms of Sunlu PETG over the last few months. When my color of choice was out of stock on Amazon I ordered their "PETG-G" instead. The description doesn't really explain what the G stands for but now I know it stands for "Garbage", with a capital G.
Printed actually okay, however, I realized there was something weird when I had a hard time removing the model from the steel sheet. It's a large model, I use a small brim to avoid warping. As the model came off, it ripped the brim in a very jagged form, with most of it still sticking to the sheet. Regular Sunlu PETG comes off smoothly. When I tried to remove the remainders of the brim from the model with my deburring tool, it was like granite. Most importantly, what was left on the (textured) steel sheet was impossible to get off. I've never seen anything fused into the surface like this. Almost like TPU when you don't use a separating agent. And certainly unlike their regular PETG.
All the spools I bought are going back to Amazon today.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE:
At one of the very first 3d print classes I took at our local makerspace, I remember the admonition and discussion when the topic turned to what filament to buy and bring in (which is allowed there) and the instructor said to be sure to get 'standard' plastics, such as generic PLA, ABS, etc., and to avoid (yeah, like the plague) those having nonstandard plastic formulae such as '-plus', 'tough', 'blend', etc.
The advice was that by using those special filaments, you would spend more (of your two or four hour block of time booked on a machine) time doing test prints and dialing things in than you would actually printing.
I'm assuming that PETg-G is one of those 'super duper' special filaments.
Now having said that, I've had good luck with Prusament PC Blend, but of course that is intended for the Prusa I3 series.
Also, some time ago when I got a good deal on a 'slightly used' Ultimaker, it came with a partial spool of what they call 'Tough PLA' which printed just fine, but again, specifically intended for that printer. I doubt if I will re-order it when it is gone.