3-dimensional printer

A 3-dimensional printer, comprising:

• an extruder to extrude a filament into a cavity;
• a carriage coupled to the extruder and to support the extruder;
• a moving unit to move the carriage;
• and
• a processor to control the extruder and the moving unit,
• wherein the extruder comprises:
• a filament feeder to feed the filament supplied to the filament feeder;
• a heating unit to heat the filament fed by the filament feeder;
• a nozzle to output the heated filament into the cavity;
• a cooling unit to cool the filament feeder to decrease heat transferred from the heating unit to the filament feeder;
• a first temperature sensor to sense a temperature of the heating unit;
• and
• a second temperature sensor to sense a temperature of the cooling unit, and
• wherein the processor controls the heating unit and the cooling unit based on the temperatures sensed by the first temperature sensor and the second temperature sensor,
• wherein the moving unit comprises:
• a frame extending in a first direction;
• an arm disposed above the frame and extending in a second direction that crosses the first direction, the carriage disposed at the arm;
• and
• a first drive motor and a second drive motor disposed at the frame such that the first drive motor and the second drive motor are spaced from each other, and
• wherein the moving unit:
• moves the carriage in the first direction when the first and second drive motors rotate in a same direction;
• moves the carriage on the arm in the second direction when the first and second drive motors rotate in opposite directions;
• and
• moves the carriage in a third direction between the first direction and the second direction when one of the first and second drive motors is operated and the other first and second drive motors is stopped.