Method of using print head assembly in fused deposition modeling system

1. A method for building a three-dimensional part with a fused deposition modeling system having a print head carriage configured to move substantially in a plane, the method comprising:

loading a print head to a receptacle of the print head carriage, the receptacle being supported from a carriage frame of the print head carriage such that the receptacle is restricted from movement relative to the carriage frame in directions parallel to the plane, but is controllably moveable relative to the carriage frame in directions outside of the plane;

actuating a snap-fit mechanism to secure the loaded print head to the receptacle to prevent the loaded print head from moving relative to the receptacle;

moving the print head carriage retaining the secured print head in the plane;

feeding a material with the secured print head;

melting the fed material in the secured print head;

extruding the molten material from the secured print head to form at least a portion of the three-dimensional part;

controllably moving the receptacle containing the secured print head relative to the carriage frame in at least one direction outside of the plane with a toggle mechanism; and

removing the print head from the receptacle.

2. The method of claim 1 , wherein actuating the snap-fit mechanism to secure the loaded print head to the receptacle comprises closing a receptacle lid against a receptacle base portion to retain the loaded print head in a manner that prevents the print head from moving relative to the receptacle.

3. The method of claim 1 , wherein controllably moving the receptacle containing the secured print head relative to the carriage frame in at least one direction outside of the plane the axis comprises a movement along a linear axis that is substantially orthogonal to the plane, or a movement along a pivoting axis outside of the plane.

4. The method of claim 1 , and further comprising measuring positions of the receptacle along the axis with an encoder assembly.

5. The method of claim 1 , wherein loading the print head to the receptacle comprises aligning the print head with alignment features of the receptacle.

6. The method of claim 1 , and further comprising communicating between the secured print head and a control board retained by the carriage frame through an electrical circuit retained by the receptacle.

7. The method of claim 1 , and further comprising forcing an air flow through the receptacle and into the secured print head.

8. The method of claim 1 , and further comprising:

loading a second print head to a second receptacle of the print head carriage, the second receptacle being supported from the carriage frame; and

actuating a second snap-fit mechanism to secure the loaded second print head to the second receptacle.

9. A method for building a three-dimensional part with a fused deposition modeling system having a print head carriage configured to move substantially in a plane, the method comprising:

inserting at least a portion of a print head into a receptacle base portion of the print head carriage, the receptacle base portion being suspended from a carriage frame of the print head carriage such that the receptacle base portion is restricted from movement relative to the carriage frame in directions parallel to the plane, but is controllably moveable relative to the carriage frame in directions outside of the plane;

closing a receptacle lid against the receptacle base portion to retain the inserted portion of the print head in a manner that prevents the print head from moving relative to the receptacle base portion;

moving the print head carriage with the retained print head along at least one axis of a plane;

depositing a material from the retained print head to form at least a portion of the three-dimensional part; and

controllably moving the receptacle base portion with the closed receptacle lid relative to the print head carriage relative to the carriage frame in at least one direction outside of the plane with a toggle mechanism.

10. The method of claim 9 , wherein closing the receptacle lid against the receptacle base portion comprises contacting at least one electrical contact to the print head.

11. The method of claim 10 , and further comprising communicating between a circuit board of the receptacle lid and the print head over the at least one electrical contact.

12. The method of claim 9 , and further comprising:

feeding a material with the retained print head; and

melting the fed material in the retained print head.

13. The method of claim 9 , and further comprising:

opening the closed receptacle lid;

removing the retained print head;

inserting at least a portion of a second print head into the receptacle base portion; and

reclosing the receptacle lid against the receptacle base portion to retain the inserted portion of the second print head in a manner that prevents the second print head from moving relative to the receptacle base portion.

14. The method of claim 9 , wherein inserting at least a portion of the print head into the receptacle base portion comprises aligning the portion of the print head with alignment features of the receptacle base portion.

15. A method for building a three-dimensional part with a fused deposition modeling system having a print head carriage configured to move substantially in a horizontal plane, the method comprising:

suspending a receptacle of the print head carriage from a carriage frame of the print head carriage in a manner that prevents movement of the receptacle relative to the carriage frame in directions parallel to the horizontal plane, but allows the receptacle to be controllably moved substantially along a vertical axis;

loading a print head to the receptacle;

securing the loaded print head to the receptacle to prevent the loaded print head from moving relative to the receptacle;

moving the print head carriage in the horizontal plane;

depositing a material from the secured print head to form at least a portion of the three-dimensional part; and

controllably moving the receptacle relative to the carriage frame substantially along the vertical axis with a toggle mechanism.

16. The method of claim 15 , and further comprising measuring positions of the receptacle along the vertical axis with an encoder assembly.

17. The method of claim 15 , wherein loading the print head to the receptacle comprises aligning the print head with alignment features of the receptacle.

18. The method of claim 15 , and further comprising communicating between the print head and a control board retained by the carriage frame.

19. The method of claim 15 , and further comprising forcing an air flow through the receptacle and into the secured print head.

20. The method of claim 15 , wherein the receptacle is a first receptacle and the print head is a first print head, and wherein the method further comprises:

suspending a second receptacle of the print head carriage from the carriage frame;

loading a second print head to the second receptacle;

moving the second receptacle relative to the carriage frame substantially along the vertical axis independently of moving the first receptacle relative to the carriage frame.