Interactive slicing methods and systems for generating toolpaths for printing three-dimensional objects

1. A method for printing a three-dimensional object, comprising:

a. receiving in computer memory a digital model of said three-dimensional object;

b. using one or more computer processors to partition said digital model of said three-dimensional object into a plurality of partitions, wherein a partition of said plurality of partitions comprises a plurality of slices, and wherein a slice of said plurality of slices comprises a plurality of segments;

c. receiving, from a user, one or more parameters that specify a printing configuration for at least one segment of said plurality of segments;

d. determining an order in which to print said plurality of segments, wherein said determining said order comprises: while one or more layers contain unprinted segments:

(a) if no segments are printed within any layers, for a first segment within a first layer, selecting a start point;

(b) else if no segments are printed on a layer that is not the first layer, setting a start point that is an endpoint of a terminal segment of a previous layer;

(c) else if at least one segment is printed within a layer, each printed segment comprising a start point and an endpoint:

while there are unprinted segments:

a) determining a start point for each unprinted segment within the layer;

b) selecting a closest start point to an endpoint of a most recently printed segment; and

c) tracing a next segment, starting at said closest start point and stopping at an endpoint following a toolpath;

and

e. generating printing instructions based at least in part on said one or more parameters, which printing instructions are usable by a printer to print said three-dimensional object.

2. The method of claim 1 , wherein the toolpath has a fill pattern selected from the group consisting of: a line, a concentric pattern, a directional line, an overhang pattern, and a hooked line.

3. The method of claim 1 , wherein determining said order includes determining a sequence that reduces (i) heat generated by said printer, (ii) a number of lifting operations performed by said printer, (iii) one or more tool change operations performed by said printer, or (iv) one or more material change operations performed by said printer while printing said three-dimensional object.

4. The method of claim 1 , wherein said three-dimensional object is printed by (i) bringing a feedstock in contact with a platform or a previously deposited layer of said three-dimensional object, and (ii) directing electrical current to flow from said feedstock and into said platform or said previously deposited layer of said three-dimensional object, or vice versa, to melt at least a portion of said feedstock and deposit said at least said portion of said feedstock adjacent to said platform or said previously deposited layer of said three-dimensional object, thereby forming at least a portion of said three-dimensional object.

5. The method of claim 1 , further comprising using said printing instructions to print said three-dimensional object.