Two questions: voltage and current. For the motion electronics, a 12–24 V DC supply feeds the stepper drivers (24 V gives snappier high-speed torque, though a foam cutter rarely needs it); the board regulates its own 5 V/3.3 V logic. Size the current for the sum of your motors' run currents plus margin — four NEMA-17s at low current is modest, so a 24 V/5–6 A supply is ample.
The hot wire gets its own separate low-voltage, high-current supply chosen for your wire length and gauge. Keep the two isolated to avoid noise and sag. Fuse both, use a proper mains-rated enclosed PSU (not a cheap barrel adapter for the motors), and add an E-stop that cuts power.
The hot wire gets its own separate low-voltage, high-current supply chosen for your wire length and gauge. Keep the two isolated to avoid noise and sag. Fuse both, use a proper mains-rated enclosed PSU (not a cheap barrel adapter for the motors), and add an E-stop that cuts power.