So we've built the machine, did a crude manual bed level and the first print was quite good! It was a 1" cube, but somehow printed only 1/2" in height. I'm searching Slic3r, and the software (can't remember the name, starts with a "p") that is in the manual that had to be used to feed the gcode via USB as Marlin wouldn't see the SD card in the one screen. That all looked good and the only thing I see in Marlin is maybe Zsteps is not right, it's set at 4000 currently - is this right for the M5 guide screws? I'm tempted to change it to 8000 and see if prints the cube the correct height.

Looking around Marlin and the slicer program I'm realizing there are ALOT of settings that I have no idea what they do...

Also the bottom of the cube was not flat, it must have pulled away from the bed. We are using Aquanet on teh bed, set at 70C, and Hatchbox PLA filament. Extruder at 200C. Any advice?