Geeetech Melzi Ardentissimo controller board kit-Heatbed PCB MK2a,Thermistor,Acrylic plate for 3D Printer Prusa Mendel The Melzi Ardentissimo is a full-featured Melzi board using the ATMEGA1284P chip used on Sanguinololu. The Melzi is a Sanguinololu firmware compatible board Melzi has micro SD on board as well. Acrylic universal support plate Heatbed PCB MK2a with soldered resistor and led ect.