ABS Warping

[curious aardvark]

any particular reason you want to print abs ?
pla and pet-g are both easier to print and just as good ((usually better) for pretty much everything.

You can print abs on an unenclosed printer - if you use a raft. I did that quite successfully for the first 6 months or so of owning a printer. Then I tried pla. No raft, stronger, better, faster, more accurate prints. never touched abs again.

But even with a raft, because of the built in shrinkage, you won't get good layer adhesion with abs.
So abs printed on an open print bed, will always be weaker than pla.