I have a 3d printer that I am building which has a heated bed, as most FDM printers. The bed is about 25"x24" and will have (4) 12"x12" silicone heating pads anywhere from 500-700W each. Each heating zone will control to a temperature setpoint using a solid state relay and PID control.
The printer will be on 240V circuit with high amp capacity, so power is not an issue here. My question is because each of the heating zones are wired independently should I buy a big PSU and run 240V from the outlet to it and then to each heater? Could I get by with just wiring each heater in parallel to the 240V outlet.
As a side note, the motherboard, stepper motors, and all other devices associated with the printer are being powered by a small PSU that steps voltage down to 24V.