This replacement hotend/platform assembly for our ERIS® Delta is a fully assembled and ready to install unit. It has been assembled and tested and installs in just a few minutes. It includes a hotend platform with hotend, fan, PCB board with the auto calibration circuit and the female 8 pin pluggable connector installed. See pics for what you get. This does NOT include the wiring up to the platform, as that is re-usable.