A month or so ago, I purchased a roll of Spectrum ecoPET 9021 filament from our hosts here. It’s black PETG.
[Edit]
I just want to make clear that I’m not complaining about our hosts here, just the brand itself. In the same order, I got two rolls of their house PLA, which is great. Just wanted to clear up any misunderstanding that my words may have created.
In my 10 years of 3D printing, I have never encountered a roll of filament like this. It’s my first ever roll of Spectrum filament, and will certainly be my last.
In my Ender 3 Pro with standard microSwiss hot end, it causes an instant clog. When I load the filament, and extrude 40 or 50mm, the filament comes out, but it looks weird. It has voids along it, like bubbles have popped.
After extruding a bit, I start a job. Not a single millimeter comes out after that. Clogged solid.
After the first time, I disassembled, cleared the clog, and tried again. Same result. I have tried drying the filament, different temps, nozzles from 0.4-0.8mm, run cleaning filament, all same result. When I cleaned it and loaded a roll of PETG (different manufacturer) that I’ve had for a while, no problem. I loaded black PLA, and printed for 20+ hours, no problem. After it cooled, I ran another job with the PLA, no problem.
After that, I tried one last time with the Spectrum filament. You guessed it, instant clog.
As I said in the subject, I’m so done with this filament, and it’s going in the garbage so that I’m not tempted to try it again. But I thought I’d ask around here if anyone has encountered anything like this before? I certainly haven’t.
Sorry for the rant, but I thought I’d ask you guys. 
