I'm seeing these strange extrusion lines perpendicular to thin walls on the top and bottom layers. No idea where they're coming from, but they're putting weird edges on otherwise beautiful prints.
STL, gcode, and profile:
Current master (maybe with last clipper fix) does much better job (no perpendicular artifacts), but there is artifact from medial-axis on both hollow cylinders - ends of extrusion do overlap.
gray is surface, green is medial-axis
Those artifacts kill thin-walled objects, because they're not buried inside the infill. I use a version of the classic thinwall box to verify the extrusion settings:
That's cut down to 2 layers to reduce the clutter; normally it's 5 mm tall.
Slicing with either the default configuration or my usual one, using 1.1.1-dev (93f4fe0) produces the same extensions on one "corner" of the square:
A detail view of that corner:
This has become a showstopper for me, as many of the gadgets I build depend on thin walls. The binary 1.1.0 version doesn't run on Ubuntu 13.10 x86_64 (#1877) and binary 1.0.0 locks up solid with my usual configuration on that STL file.
Is there a workaround for this problem?
All the files are on my Dropbox account:
Thanks for any advice...
Bugfix: thin walls forming a closed loop had overlapping segments at …
…their endpoints. #1948 #1875
Fixed! And added a regression test.