Also that's a pretty cool rendering of CAD and a picture all in one image. How did you do that?

 

Conveyor Belt = Red

Do you actually have a printer? How are you going to print on a conveyor belt? If you look at mr.chips image the bed is a solid flat surface that has some type of heating to it, not a rubber flexible belt.

 

X is left to right motion of extruder head while facing printer.
Y is the bed motion front to back.
Z is vertical axis driven by screw drive.

X and Y are just the opposite in a milling machine, what I'm more used to.