I've been printing (UM2) exclusively with ABS lately and get perfect parts every time. I'm using Pro Series from Matterhackers. Here's the settings that are working for me: 245C extruder, 110C build plate, no fan, 90% fill, no brim, Wolf Bite solution on glass. I'm currently running 36 pieces of a part that's 3 1/2" x 1 1/2" x 1/2" tall (obviously spread over several builds). I've tried building on masking tape, Kapton tape, BuildTak glue stick and now Wolfbite. Wolfbite blows the others out of the water. The parts hold tight to the glass w/o a brim until the build is over. As the glass cools you can hear the parts breaking free due to the ABS and glass having difference shrink rates. The parts literally jump off the glass by the time everything has come to room temperature. Even a majority of the flimsy skirt releases when it cools. If you prefer ABS and haven't tried Wolfbite yet then do yourself a favor and get some.