Windows 7 64-bit
I suspect this is intended behavior - outer surface perimeters end with a really tiny inwards movement to hide the extrusion end. Otherwise it tends to leave a noticeable seam on the surface which is problematic for dimensional accuracy.
As your part is just 5x5mm, the toolpath preview is magnified a lot...
This pattern would be on every layer if it was to hide the seamline but it is random and not on all layers or in the same place. My seam is aligned so if it was to hide the seam it should only be in one place.
Sometimes there is one bump but at other times two.
Well, in those images my guess would be polygon offset artefacts. Slicing vertical holes (or cylinders) at different heights will result in differently segmented circle polygons although they will have the exact same shape. The reason is that each square surface segment around a cylinder is made from at least two coplanar triangles (or even more, depending on the geometry of the model). Offsetting these irregular polygons several times can on some occasions produce artefacts like these..
Come on, those things are like 0.01mm...
(anyway, those are caused by the upstream -excellent- Clipper library, so that's not something I can fix myself)
What is the web address of the clipper library?
Is it causing the problems with the lines going through the hexagons (honeycomb) as well?
The block.stl above is perfectly round.
Slic3r 1.2.2-dev (2014-12-22nd 1:39 a.m.)
Just a note: The walking-machine.stl still has the problem.
Clipper library can be found here: http://angusj.com/delphi/clipper.php
Remove artifacts in original slices so that they're not amplified whi…
…le generating perimeters. #2561 #2416
Okay, these artifacts are now filtered out by Slic3r.