Indeed Tom is right, I never use a fan on ABS and it certainly helps the lifting situation. Another method I use which combined with not using a fan is a small fan heater, it doesn't need to be an infra red heater just one of the cheap ones, in England B&Q sell them for about 5 or 6 GBP so they don't hurt the budget and the saving on material pays for the heater in the long run.