abs filament curl upward

[curious aardvark]

umm, what the hell kind of raft is that ?
You using replicator g ?

Have you tried using makwerware instead of raplicator g ? it's more user friendly (well sorta kinda - as long as you don't want to print without a raft) and makes much better rafts.

That said I have yet to print a long solid object without curl. Just not sure it's possible with abs and the flashforge setup. Probably with a heated chamber you could do it. But even with blue tape and bed at 130 I can't print long stuff without curling.

My theory is that it's caused by the varying temperatures i the different abs layers and it's the colder higher layers that contract and pull the plastic off the bed.