Abstract: In one implementation, a pressure sensitive stylus may receive, at a controller, drawing area coordinates, a stroke pressure from a voltage generated by a piezoelectric crystal, and a stylus coordinate direction from a plurality of fiber optic sensors, determine a drawing area from a wireless signal frequency corresponding to the drawing area coordinates, determine a drawing mode of a stylus stroke, wherein the drawing mode includes a stylus coordinate direction and a stylus stroke type, and transmit the drawing area and the stylus stroke.

Abstract: In some examples, an apparatus for a printer comprises an extruder assembly comprising a plurality of extruders to feed respective filaments for deposition during a printing process, and a motor to drive engagement surfaces in the plurality of extruders when feeding the respective filaments in a feed direction. The extruder assembly further comprises moveable elements, each respective moveable element of the moveable elements to selectively disengage a respective filament of the filaments from a respective engagement surface of the engagement surfaces, the respective filament disengaged from the respective engagement surface in a direction different from the feed direction of the respective filament.

Abstract: In one implementation, a pressure sensitive stylus may receive, at a controller, drawing area coordinates, a stroke pressure from a voltage generated by a piezoelectric crystal, and a stylus coordinate direction from a plurality of fiber optic sensors, determine a drawing area from a wireless signal frequency corresponding to the drawing area coordinates, determine a drawing mode of a stylus stroke, wherein the drawing mode includes a stylus coordinate direction and a stylus stroke type, and transmit the drawing area and the stylus stroke.