Filament feeding device having a capacitive filament displacement sensor for use in additive manufacturing system

摘要

A filament feeding device includes a drive mechanism and a displacement sensor. The drive mechanism is configured to feed a filament along a feed path. The displacement sensor is positioned adjacent the feed path and is configured to determine a velocity and direction in which the filament is fed along the feed path based on at least two capacitance measurements that vary in response to movement of the filament along the feed path.