Small multiple parts covering print bed - what fan setting?

Hi All,

I'm looking at printing the following (see attached print screen please) - a bunch of small parts which almost cover the entire build area. I hope to be using Z-ABS for the print. My concern is, the parts and raft as a whole may start to lift, warp, etc. What fan setting should I be using? Auto, 0%, 20%, 100% etc.

Thanks!

I typically leave the fan on AUTO but use an abs/acetone slurry coat on the bed to insure it won't lift.

Officially it's called "Z-ABS Juice" and instructions are here  http://support.zortrax.com/preparing-z-abs-juice/

Thanks David. So far I seem to be having no trouble. Auto Fan. I had totally forgot about the "Z-ABS Juice" thing... thanks for reminding me. Cheers.