I can't print PLA if the job takes too long, because of "heat creep" and jamming. I'm hoping an aux fan will keep the Budaschnozzle at a PLA-happy temperature. Gonna try a huge Yoda print as a test.
(I printed this shroud on my Printrbot+, because my Taz doesn't print ABS for shit)
I picked up a super-blowy 40mm fan at Radio Shack. It moves significant air. I have high hopes. For the time being, I have this wired to a switch and a 12V wall wart. I'd like to wire this into the RAMBo board and have some control when slicing.
Update: The green Yoda is 13 hours into an 18 hour print and it is coming out flawlessly. No signs of overheating, heat sink is fairly cool and awash in a turbulent spa of rushing air.