I have a Magnum Phoenix GS CNC router. I replaced its outdated electronics with PBX-RF RF Isolated CNC Breakout Board and three MondoStep 7.8A drivers. I use Mach3 software to control the machine. What do I have to buy to convert my CNC router to 3D printer? I think I have to buy:

3D printer head > Which one is best?
Stepper motor for 3D printer head
Stepper motor driver
Heated bed

How do I configure Mach3 software for 3D printer?
I have Cut2D V1.5 software. Do I need different program to convert 3D models into code for Mach3 software?