How to prevent bend (or warping) with M3D printer?
You can to print a brim, a thin layer on the bottom connected to the model. This will help hold it in place. Since it is thin (one or two layers) it will not warp itself.

The brim is not the same thing as a raft. A raft is under the model. The brim is on the same layer as the models bottom layer but outside the model. It looks something like this:



I assume that you use a heated bed if you have one?

Also, it is imperative that you get a good first layer. Calibrate your machine carefully.