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Remove the original PTFE tube from the stock hot end. Slide a new piece down in until it hits the nozzle, then cut it 54mm above the top of the cold block.
Print the mount on the cut off corner so it is all at a 45 degree angle, and you won't need support.
Slide the mount down over the new PTFE tube and snap it into place on the heat sink mounting hole stud (the hole where the previous large extruder gear was mounted). Snap the other side of the original extruder on. Run the mounting screws through as if they were going into the extruder motor, but instead fasten with M3 nuts.
Assemble the BMG extruder on top of the mount's V6 style post. Install the original motor with the wiring connections facing downward. This allows the original short cable to connect to the extruder board.
Attached the extruder board and make all the electrical connections. Set your steps per mm to 415 and test it out.
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