Before assembling the extruder, check your bolts. E3D is somewhat inconsistent in which bolt sizes they include in the package. Some people get M3x35mm bolts, and others don’t. You’ll probably need 3 of them to secure the heatsink thru the extruder body into the stepper motor because the effector thickness where the extruder mounts is 4mm (and the E3D assembly assumes 2mm.)
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