Desktop 3D printer heating bed has experienced the MK1, MK2a, MK2b generations optimization improvement, now the latest out of the third generation MK3 hot bed. MK3 compared with MK2 has an obvious advantage, namely MK3 can choose 12 v and 24 v two voltage, stronger practicability; MK3 is aluminum plate process, namely the adhered on the surface of the aluminum plate heat resistance wire, its coefficient of thermal conductivity, pressure value, such as thermal resistance performance was significantly better than the previous series, than the MK1 and MK2 in such aspects as light, thin, small, reliability is better!