Grab the feed lock handle of the selected extruder, pull it up and lock it open.
Feed the filament thru the bottom hole in the filament feeder, gently push it inside
mechanism and clear plastic tubing, until it reaches the extruder assembly and you
can't push t anymore.
Release the lock handle, it will raise into closed (engaged) position.
About the pressure setting (black plastic) knob on feeder unit: you should always
use the minimal possible pressure needed to reliably feed the filament.
Fig. 7: Filament feeders, the one in foreground is locked open (disengaged)
Illustrazione 8: Loaded spool, feeder engaged
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