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sparse moves on layer boundary #15

@clemtaylor

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@clemtaylor

I generate gcode in python and print it. gcodeview seems to have a bug dealing with sparse moves (moves with not all axes specified) across the layer boundary.

For example:

G1 X70.000 E64.86318 F3000.0 ; 10.00mm
G1 X60.000 F13500.0
G1 X50.000 E64.99540 F3000.0 ; 10.00mm
G1 Z0.60000 F6000.0 ; layer 3  
G1 F13500.0
G1 Y150.000 E66.31762 F3000.0 ; 100.00mm
G1 X60.000 E66.44985 ; 10.00mm  
G1 Y50.000 E67.77206 ; 100.00mm
G1 X70.000 E67.90429 ; 10.00mm  

The first move of layer 3 is to "X50 Y150", but the X50 isn't specified because the print head is already there. With the latest gcodeview this is rendered incorrectly: http://i.imgur.com/zqB0P.png

FYI, the gcode file is me testing out intersecting infill patterns.

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