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Reprap mendel offsets outline from infill of printed object.

Posted by brokentoaster 
I have a problem where my reprap will print the outline of every other layer in the wrong place.

I end up with a solid object interleaved with an outline.
This only happens for some files. Some files print fine. Is this likely to be an error in the host software? It is repeatable with the same gcode file. It looks like the initial X-Y placement of the print head ofter doing the nozzle-wipe/ shield bit is being skipped or left out.

any ideas?

an example of the gcode file is at [brokentoaster.com]
and stl file at [brokentoaster.com]
Re: Reprap mendel offsets outline from infill of printed object.
August 10, 2010 06:22PM
This is still happening in the current host software (July 2010). In the previously posted files the first error is at layer 3.

The gcode does not do the shield as per normal
Quote

;#!LAYER: 3/50
G4 P6 ;delay
M107 ;cooler off
G4 P20 ;delay
G1 F5.0; feed for start of next move
G1 Z0.45 F30.4 ;z move
G1 Z0.6 F5.0 ;z move
G1 F1500.0; feed for start of next move
G1 X1.0 Y0.5 F2209.5 ;horizontal move
G1 X2.0 Y0.9 F1500.0 ;horizontal move
G1 F8000.0; feed for start of next move
G1 E3.3; extruder dwell
G1 F1500.0; feed for start of next move

The start of layer should look like the following
Quote

;#!LAYER: 2/50
G4 P14 ;delay
M107 ;cooler off
G4 P20 ;delay
G1 F5.0; feed for start of next move
G1 Z0.15 F30.4 ;z move
G1 Z0.3 F5.0 ;z move
G1 F1500.0; feed for start of next move
G1 X-1.5 Y-1.5 F2709.5 ;horizontal move
G1 X-3.0 Y-3.0 F1500.0 ;horizontal move
G1 F8000.0; feed for start of next move
G1 E3.3; extruder dwell
G1 F1500.0; feed for start of next move
G1 F3000.0; feed for start of next move
G1 E5.0; extruder dwell
G1 F1500.0; feed for start of next move
G1 X-3.6 Y-0.2 E7.9 F3000.0 ;horizontal move
G1 X-4.3 Y3.6 E11.7 ;horizontal move
G1 X-5.0 Y7.0 E15.2 F764.6 ;horizontal move
G1 Y3.5 E18.7 F3000.0 ;horizontal move

Does anyone else have this problem or any idea why the reprap host software would generate gcode like this?
Test GCode
Test STL

The gcode produced by the 20091106 release of the reprap host does not contain these errors.
The 20100806 release still makes these errors.

Edited 2 time(s). Last edit at 08/12/2010 05:18PM by brokentoaster.
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