Uninstall your stock extruder on the Rostock Max v3 by removing the 4 screws fastening the extruder to the stepper motor.

Remove the blue stepper motor knob.

Remove the (2) 10-32 screws attaching the side plate to the printer frame.

Remove the extruder and side plate from the printer.

Remove the (2) 6-32 machine screws and nylon lock nuts fastening the extruder to the extruder motor plate.

Make all attempts to keep the extruder together to prevent the spring from becoming sprung.