Update (for those that care). Cleaned off the Z axis screw and reapplied a little of the green grease that came with the printer. Did a few Atomic Pulls. When I pulled the fan shroud off to check the PTFE coupler, I found this beauty. The heater block is encased in a blob of ColorFab XT. A little surprise left over from this failed print several weeks back. I didn't realized it had gotten up inside the fan shroud. [print=4285][/print] Heated up the print head and pulled it off with need