Now that your Extruder is complete, it's time to bolt it onto your 3D printer frame. Your 3D printer works by feeding a plastic filament into the heater core of the Extruder. The plastic melts and is then forced through the Extruder's nozzle and applied to the worktable to print three dimensional objects.
You've still got some electronics to handle (all those little circuit boards that actually allow the machine to work) but you'll deal with those parts in the next chapter. This chapter will be short and sweet; you're going to connect the Extruder and the last stepper motor to the machine.