The extruders pull filament from the reel via the delivery tubes and drive through a hot-end
to produce a thin molten filament of plastic. The extruder draws each layer with this
filament. After each layer is produced the bed increments down so that a new layer can be
drawn on top of the last, building up the 3D model. A second (optional) extruder
automatically prints support filament for printing overhanging-features.
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