ABS really curling more at higher extrusion temperature?

I'm printing a model with a relatively thin shell (think of a hollow box with 1mm shell width, but it's not really a box) on a 3D printer we have at work.
I'm printing in ABS at 250C / 110C (manufacturer recommended settings). The ABS warps a lot. Much more than on my personal Prusa i3.
For anything that's 10cm or more, the edges just bend too much, no matter how much hairspray I put.

So I went an bought a PEI surface, and now the ABS sticks to the heated bed quite well, but something's gotta give. E.g. if a part of my model is printed over some support, it detaches from the support and wraps. If the part is more solid and mostly touches the build plate, it will have cracks at various heights.

Comparing with my Prusa i3 (where I print at 225C/110C), I see a lot more wrapping. Is this because of the higher temperature?
I can only say that the printer at work is much better at overhangs - in my printer overhangs get curled and are just a mess.

So is higher temperature better? Worse? Is these something else that might be causing this?

Thanks.

Warping with ABS (especially thin parts) is due to surrounding temperature. If you want to stop the issue you need to raise the temperature around the part & printer and the best way to do that is to build an enclosure around the printer (even a cardboard box will help). If you plan on doing these items often then building a proper insulated box is preferred, just Google 3D printer enclosure and go to images to get the idea.

Edited 1 time(s). Last edit at 03/01/2016 11:18PM by tmorris9.

The higher the temperature differential between extruded filament and the air around it the more it curls. Hence no fans for abs, unless they're very low air flow and truly omnidirectional.