Additive manufacturing device

1. An apparatus for additive manufacturing comprising:

at least two independently driven material dispensing heads configured to deposit a material and form at least one material layer of a 3D object, the layer comprising separate segments;

an actuation mechanism constructed to move the at least two independently driven material dispensing heads relative to a support configured to support the at least one material layer of the 3D object being constructed; and

wherein the apparatus is configured to produce a meeting zone between adjacent separate segments with cross section characteristics similar along the segment.

2. The apparatus according to claim 1 wherein the at least two independently driven material dispensing heads deposit the material to form the same layer of the same 3D object.

3. The apparatus according to claim 1 wherein the at least two independently driven material dispensing heads deposit the material to form at least two different layers of the same 3D object.

4. The apparatus according to claim 1 wherein the support configured to support the same 3D object is at least one of a group of support planes consisting of a single level support plane and a multilevel support plane to support the same 3D object.

5. The apparatus according to claim 1 wherein the actuation mechanism of the at least two independently driven material dispensing heads includes a track and is constructed to move the two independently driven material dispensing heads simultaneously.

6. The apparatus according to claim 1 wherein the actuation mechanism constructed to move the at least two independently driven material dispensing heads is one of a group of mechanisms consisting of a screw and nut, a rack and pinion and motorized pinions for the actuation of each the at least two material dispensing heads individually.

7. The apparatus according to claim 1 wherein the two independently driven material dispensing heads are located along a track at a distance from each other and wherein the distance between the two independently driven material dispensing heads along the track is adjustable.

8. The apparatus according to claim 1 further including a mechanism configured to set and maintain a minimum distance between the two independently driven material dispensing heads.

9. The apparatus according to claim 1 further comprising at least one material solidifying radiation source and wherein the material solidifying radiation source is one of a group of material solidifying sources consisting of a ultraviolet radiation source, an infrared radiation source, and a heat source.

10. The apparatus according to claim 1 wherein at least one material dispensing head is configured to deposit the material at a variable deposition (rate) speed and to deposit a variable amount of material to form the meeting zone of the separate segments of the same material layer.

11. The apparatus according to claim 1 wherein a missing height of one segment is complemented by the height of other overlapping segment.

12. An apparatus for additive manufacturing comprising:

at least two independently driven material dispensing heads configured to deposit a material and form at least one layer of a same 3D object;

an actuation mechanism constructed to move the at least two independently driven material dispensing heads relative to a support configured to support the at least one layer of the 3D object being constructed;

a computer configured to generate and control at least one dispensing head travel trajectory and a material dispensing function of each of the at least two independently driven material dispensing heads; and

wherein the independently driven material dispensing heads are configured to dispense material in at least a part of separate segments of the same layer simultaneously,

wherein at least one material dispensing head is configured to deposit the material at a variable deposition (rate) speed and to deposit a variable amount of material to form a meeting zone of the separate segments of the same material layer.

13. An apparatus for additive manufacturing comprising:

at least two independently driven material dispensing heads configured to deposit a material and form at least one layer of a same 3D object;

an actuation mechanism constructed to move the at least two independently driven material dispensing heads relative to a support configured to support the at least one layer of the 3D object being constructed;

a computer configured to generate and control at least one dispensing head travel trajectory and a material dispensing function of each of the at least two independently driven material dispensing heads; and

wherein the independently driven material dispensing heads are configured to dispense material in at least a part of separate segments of the same layer simultaneously,

wherein at least two of the separate segments of the same layer have a meeting zone of the two segments, and wherein a missing height of one segment is complemented by the height of other overlapping segment.