Is carbon killing your nozzle? A technical analysis and new product from E3D. (Lots of microscope images of nozzle wear!) This has been a lot of fun, with surprising results for how aggressively carbon wears brass nozzles out. Really enjoyed spending some quality engineering time under the microscope, doing some cool metallurgy, and lots of printing of the weirdest materials around.
Very pleased with how the new nozzles perform, I literally cannot get them to wear, no matter what nasties I run through them.