With nema 14 an Arduino Mega2560 Ramps 1.4 and $2 drivers would be more than enough have a look at something like this, available on aliexpress for around £20 power supply 12v either PC ATX with slight modification or 12v 300w to alloow enough power for laser diode hot end etc. Have a look at RepRap Wiki for details on this sort of build.
1pcs Mega 2560 R3 + 1pcs RAMPS 1.4 Controller + 5pcs A4988 Stepper Driver Module +1pcs 12864 controller for 3D Printer kit