Building a RepRap 3D Printer Tutorial: Assemble the Extruder | packtpub.com
Mounting the E3D hot end requires some special steps. You will need to heat it up; this is why you had to first finish the wiring and install the software.
Heat up the E3D hotend and fix the nozzle
Assemble the direct extruder motors, the idlers bearings, and fans
Mount the hotends and the active cooling duct
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