RepRap Kossel

I'm building a Delta style 3d printer using the Arduino Mega 2560 and Ramps 1.4. This shield is designed for 4-wire steppers to run the x,y,z axis, and extruder. Unfortunately I bought one of the few Nema 17's with six wires (Nema 17PM-K402). Is it possible to use this motor in place of the 4-wire motors with a project such as a Delta printer and if so how would one wire it?

Yes, it's possible. Just disconnect the two center taps and use the remaining 4 wires. A lot of NEMA 17s have 6 wires if you look (especially those with removable wires), just two are left disconnected.