Hi guys,
I am trying to use the new 13.07 Cura engine downloaded directly from Github (https://github.com/Ultimaker/CuraEngine). It works significantly better than 13.06 on thin walls, but I still have problems with it. I think it's worth reporting here because Daid and other people seem to be actively working on this issue.
My model is a cone shaped hollow structure with its wall thickness varying smoothly from 1.2mm to 0.8 mm, from the bottom to the top. The following picture is a successful print on 13.07.
On 13.06, I had too many blobs generated (and gave up a full print), as shown below:
However, I still have problems with 13.07 in the transition layers from 1.2 mm to 0.8 mm, which can be seen in the detailed pictures below:
The random blobs shown in the picture were from unexpected retractions. And (more seriously) there were a few critical layers which showed random movements of the head and resulted in many blobs and strings inside the cone, as in the picture below:
I uncommented the following two lines in the source code and commented out line infill. The problem above happens for both of the infill types.
int sparseSteps[1] = {config.extrusionWidth};
generateConcentricInfill(part->skinOutline, fillPolygons, sparseSteps, 1);
Some important parameters I adjusted:
Layer height 0.2 mm
Shell thickness 1.3 mm
Print speed: 60 mm/s
Retraction speed: 30 mm/s
Retraction distance: 4.5mm
Here are my STL model and gcode file.
https://www.dropbox.com/s/svyeo5lv2r0wwwp/cone.zip
I can help as far as I can, like printing again with modified source code, or even playing around with the source code if somebody gives me some idea.
Best regards,
Gloine