The Swapper3D requires integration with the Prusa i3 with some small changes:  Either Octoprint or an updated Marlin firmware version which enables serial communication to the Swapper3D. This is to coordinate the nozzle swaps and the filament switching at the correct time and tell the 3D printer when the swap is complete. Power is delivered to the Swapper3D from the 3D printers power supply by 2 wires.  3 Wires (Tx, Rx, Ground) are also run from the 3D printers main board to the Swapper3D for Serial communication. The Z stepper current must be increased to compensate for the additional sprung weight on the X axis. This causes the Z stepper driver on the Einsy board to get a little too hot. To compensate for this we are including Heat Sinks and a case fan for all pledge levels. You will need to clip some of the vents to make room for the heat sinks. We include 4 heat sinks because the stepper drivers were always a little too hot so it's a good opportunity to address that and keep everything cool. With these changes the stepper drivers stay cool to the touch even after 24 hours of printing with the Swapper3D.