Hi Mark, I had similar issues in the past with various plastics, which resulted in jamming the extruder the only option we had was to open the barrel and clean it.
Are you working alone or a team of people working on this project.
My name is Anirudra, I want to start a 3D printing startup for recycling waste plastics. I have worked with 3D printers and plastic recycling for two years. I am looking for like minded and resourceful people to join the movement.