The suspect: MeltInk White PLA/PHA Lot 16 1027 01, purchased from SeeMeCNC this past week.
Upon investigation I found the jams were caused by swelling of the filament diameter up to 2.13 mm.
![Shocked :shock:](./images/smilies/icon_eek.gif)
The first swollen spot was about 2 cm long and it caused the filament to become stuck in the Bowden tube near the HE280 where the tube makes the final turn. It required a large amount of force to pull it out of the tube.
The second swollen spot was about 8 cm long (at 2.00 to 2.14 mm dia) and it was too big to enter the extruder cold end.
My questions are, how common are these filament defects, and do I have a case for returning the material?
It is easy to feel these swollen spots so I inspected about 10 meters off the spool but could not find any more such defects. I cut off that 10 meters and trying from the spool again. If it jams one more time like this I'm not going to use it anymore.
Here is a picture. You can actually see where the filament bulges in diameter.
[img]https://c1.staticflickr.com/6/5782/30590737344_948d70c259.jpg[/img]