Hand-held three-dimensional drawing device

An extrusion device comprising:

• an inlet, an outlet, and a longitudinal axis between therebetween;
• a filament-engaging first member configured for moving a filament along a travel path when the first member is rotated;
• a filament-engaging second member restricting rotation of the filament relative to the first member as the first member is rotated;
• and
• a heater disposed along a travel path between the filament-engaging first member and the outlet to receive the filament from the filament-engaging first member.

An extrusion device comprising:

• a housing having an inlet, an outlet, and a longitudinal axis between therebetween,
• a filament travel path extending along the longitudinal axis;
• a drive mechanism disposed along the travel path for engaging and urging a filament along the travel path toward a heater configured to heat the filament;
• and
• an extrusion control mechanism rotatable about an axis and having an outer circumferential surface adjacent to an outer surface of the housing for controlling a rate of extrusion of a filament out of the outlet.