Splitting the straight lines on perimeter

[angar79]

I am found the fact that a straight line for some reason splitted into several colinear parts. This cause extrusion into several stages mixed with zero movement vectors. Splitting takes place at the border triangle of the triangular mechanics!

STL in SolidWorks:

Builded model:

Layer 0 in Skeinforge(g-code builded in Slic3r):

Layer 7 in Skeinforge(g-code builded in Slic3r):

Repetier-Host:

Slic3r version 0.9.2
Config
STL-model
OS Windows 7 Professional x64

[angar79]

Btw, I have no this problem with Slic3r 0.7.2b

[mesheldrake]

This is similar to issues #700 and #702, because turning up the scale number in offset() mostly fixes the problem, but again, not completely.

These animations come from me clicking on different layers of the toolpath, to highlight individual moves. In the first one you see several short segments, essentially reproducing angar79's issue. In the second image, I've set scale=1000, and the same process reveals that the straight paths are single moves - mostly.

offset scale = 1

offset scale = 1000

OhmEye says the scale=1000 fix causes problems for other STLs though. And I thought setting scale large enough would get rid of these artifacts completely, but small ones persist. So setting scale isn't the only issue.

[mesheldrake]

Fixed the last few broken lines from last test case by setting scale for the safety_offset() function to 10000, matching that of the offset() function. See #702 for code. Result: no more fragmented straight movements here

[alranel]

@angar79, collinear paths should not be visible in the printed object. We've been getting some complaints from people about Slic3r "oversimplifying" the geometries (even by 0.02mm or something like that), so the strong choice was made to almost keep the original data without any decimation.

Still, any modern firmware should just print collinear paths as single movements. What firmware are you using, and what did you use to make that picture?

[alranel]

This is related to #772