The heated bed, hotbed , buildplate

There are multiple heaters to choose from, i will give some examples.

The MK2a heater is suitable to use with a 12 volts PSU, It is suitable for use wih a 24 volts PSU (through a MOSFET) as well.

It is 2mm thick and it needs an aluminium plate on top with possible a sheet of glass to use.

The MK3 heater is a combined heater and buildplate in one, so a sheet of glass on the top and print away