The base model is really designed just for printing with PLA.

+1
Without a heated bed, printing ABS is possible, but very difficult. I have printed in -6c in ABS with a custom acrylic case with poor results. PLA works great in these conditions. But ABS will require higher temps and an enclosed case at least.

If you do not want to upgrade to a heated bed, or do not feel ready for the task:
*upgrade the print surface to glass and apply extreme hold hairspray or glue
*make a case from acrylic...should only cost about $20 if you go hog wild in the design. This will keep the heat in which is needed for ABS since it cools too fast.
*properly calibrate your Z. If you start printing your first layer too high, it may bond other layers, but will guarantee lifting
*calibrate your extruder. If you are under extruding, even if height is dialed in, you will have lifting.
***read through Soliforum as much as possible and post as needed. I have solved so many problems just by scrolling through this site.

Hope this helps!

I just bought a base model sd2.  Was this mistake?
Trying to keep costs down etc,  but now finding that its near impossible
To stop corner lift. Spent last 4 hrs trying to stop corner lift on object 80mm by 50mm

Why is solidoodle supplying base model without making it clear how limited base object area can be before lift starts ?
Will upgrade to pro kit really go long way to stopping my issue
And lift be stopped with it?
On the plus side resolution on finish good ..

Appreciate insight here..should I order upgrade kit to have any chance of success?