So, I was having a LOT of trouble extruding. Lots of clicking and clunking from the feeder and missing or really horrible layers. I noticed the filament that was extruding was thin and curling at the nozzle. I was supicious of a clog, but decided to swap filaments just in case. New filament, same problem.
Turns out, my nozzle was clogged up pretty bad. I disassembled the printhead by taking the bottom cover off using a 5/64" allen wrench, removing the nozzle with a 5/16" socket and heating the nozzle up with a tiny blowtorch while gently holding it in a pair of pliers.
A tiny bit of smoke and some gunky melted plastic dripped out. I still couldn’t see all the way through the nozzle, so I took a piece of 26 AWG kanthal wire that I use for my electronic cigarette coils and poked it through the hole from the top. It popped right through (it’s pretty much an exact fit) and that was that. I put it all back together and now it’s printing and feeding perfectly again.
I realize I should have taken pictures, but it’s pretty straightforward. Just thought I’d share in case anyone else feels like they have a clogged nozzle that’s causing problems. Trust me, I checked everything else I could think of first. You perform this at your own risk.
Also, I can’t confirm this, but the nozzle looked nearly identical to these: http://www.amazon.com/Printer-0-4mm-Extruder-Nozzle-1-75mm/dp/B00L4UXQ42/ref=sr_1_2?ie=UTF8&qid=1459394484&sr=8-2&keywords=printer+nozzle
I’m thinking about picking some up just in case (and to see if they are compatible).