One final comment before I turn in for the night. PLA sticks better to the build plate (Well, in my experience, with my XYZ Pro 3D printer) than does ABS. I'm not sure why. Anyone that's more experienced with 3D printing know why?
The ABS, & the PLA parts I've printed have
ALL been printed on the same bed tape, same rafts, (actually with the PLA I found it's not necessary for rafting, nor a heated print bed) same supports, same temps, & identical printer settings. Actually I even tried turning up the temp(s) a bit with the ABS, & haven't been able to make it adhere as well to the printbed as the PLA.