I'm having a problem when I print large pieces. It's happening like 50% of the time. The first layers don't attach very well to the rest of the object, and I can't figure out why. Does anyone have an idea? The only parameters that I've changed from default are the first layer thickness (increased one unit) and the first layers speed, that I've reduced a bit.
Here's a picture (bad camera, sorry) of the pice I've been trying to print: