I have 4-5 hours on mine and I am at the point where I will bolt the aluminium rails on to the frame. I'm really shocked, I thought I would be pulling an all nighter to build it but have been enjoying the process and just working on it when everyone else in the family is watching tv or doing something else.

Draled, thanks for the info, I think I will follow your lead and mount the fan to pull air away from the head for now. I see so many folks mentioning problems with ABS warping, I hope I don't regret starting with a spool of that. I just figured I would need abs to print replacement parts.