Fusion3 Design F400 - Inspecting & Cleaning the Extruder

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Use your other hand to stabilize the print head and prevent it from rotating while you tighten the hot section back
up. Do not over-tighten as you can bend the thin heat break section; aim for approx. 10-15 in-lbs of torque.
11.4 Inspecting & Cleaning the Extruder
Check the extruder for:
 Debris in the feed gear
 Slop or lash in the gears
 Correct spring preload
Service interval: Every 40 hours of print time
11.4.1 Feed Gear Debris
With filament removed from the extruder, open the idler bar. Visually inspect the teeth in the metal feed gear for
debris. Rotate the extruder by hand and inspect the full gear.
If you see debris in the teeth, use the toothbrush included in your toolkit to brush the debris out of the teeth.