Somethings still not right

Printer moves on all three axis smooth. I load an .stl file into fab interpreter, position the head and "execute". Everything works as it should except the X axis (front to back). It's movement is elongated.

After several messy attempts to print something, i taped a piece of white paper to the base, wedged a pencil in place of the syringe, and loaded a 1x1" square file. The attached image shows what it printed.

Could this be a software problem? It seems pretty consistent.

Could i have made an assembly error? (and the error is the gear ratio?)

Help!