print bed not raising during print

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Hello everyone. I have a Ultimaker 2 clone that I built about a year ago based off of this build guide : https://www.thingiverse.com/thing:1178406

Im running it with an arduino Mega 2650 and a Ramps 1.4 board. I was having some weird bugs with the firmware recently so I decided to install the latest version of Marlin today. It went smoothly and everything is working great when I test the printer using manual controls. The problem is that when I start a print the print bed stays in the lowest position instead of raising up to the extruder nozzle. My Z endstop is at the bottom, so essentially the print is starting at 0 on the Z-axis instead of the Zmax. I figure this must be an easy fix but Ive been playing with it for a while and I haven't been able to get it working. I have attached my configuration file. Let me know if you have any ideas.