RepRap MK3 Heatbed Heated Bed Heat Bed 3mm Aluminum PCB Board Heat Bed 12V/24V Dual Power for RepRap 3D Drucker Printer Prusa i3 with Thermistor & Wire (1) Dual power supply. Operate at 12V or 24V. You can use thinner wires when operating at 24V. (2) A central mounting hole on the front side to allow for three point mounting. This is much easier for bed leveling in comparison to 4 point mounting. First level the side with two holes and fix in place, then level the side with one hole. (3) Large solder pads for multiple wires (ribbon cable) or a SMD pinhead connector can be mounted. (4) With 15V on the 12V terminals will maintain approx. 115 degree Celsius without regulation. (5) Running 24V on the 12V terminals will heat up the heatbed to 100 degree in only 2 minutes.