Active cooling for Pico hotend

I've run into an issue lately where my Pico hotend jams after about 20-30 minutes of printing PLA. I can verify that it is jammed as I can not move the filament in either direction even manually. An interesting thing is that after letting the hotend cool off for an hour or so, the jam clears and I can print again.

To me this indicates insufficient active cooling, but I already have a small fan blowing and a plastic duct directing air over the Pico's fins. What else can I do to improve the situation?

The odd thing is this just started happening, after weeks of successful printing.

Edited 1 time(s). Last edit at 02/02/2015 07:41PM by mk3a.

I was looking at the Pico, seemed like a cool piece. You may be melting above the hot zone. Maybe a cooling fan where filament enters extruder. Made all the difference on my machine but I don't have a bowden tube in the way. Good luck.

Overall I'm really pleased with the Pico. I wish the rest of my printer was up to that level of quality.