This is a PCB Heatbed for the eMAKER Huxley, but should work on any 3D printer which has a 140x140mm print area.Thanks to prusajr for the information provided in his PCB heatbed, thing:2172, from which this thing is derived.Track widths are set to give 4.5Ohms at 25C, rising to 6.6Ohms at 150C (for standard 35um copper cladding). For a 19v power supply, this gives a power output of between 80W and 54W.I printed this on press'n'peel which irons on to a bare PCB, then etched it.The thermistor solders onto the centre of the board. I then painted the track with black stove paint.