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To repeat: Please read the E3D V6 Assembly Guide before starting assembly of the hot end. Note that we do put the fan on opposite of how E3D installs. That's so the fan air flow is more effectively cooling the Micro Extruder stepper motor.

Install the nozzle on the side of the heat block that has the cartridge heater hole closest to its face as shown in the first photo. Screw all the way in then back the nozzle out 1/2 turn. There must be a small gap as shown.

Screw the heat break all the way into the heater block as shown in the second photo.

Tighten the nozzle to the het break with a 7mm wench.

Make sure the short piece of PTFE tubing provided by UltiBots is clean and square on both ends. The openings should not be restricted. Insert the tubing into the heat break as shown in the third photo.

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