Spiral vase start with an excessive extrusion rate

liftbag commented 5 years ago

Version

1.41.1-rc+

Operating system type + version

macOS Mojave Version 10.14 #s

Behavior

The first extrusion loop manifests an abundant over-extrusion at the start which decreases until it disappears at the end of the loop.
Any object made in spiral vase mode can reproduce the issue
The first layer should not have over extrusions During the first loop of the spiral, the height of the nozzle relative to the plane or to the underlying solid layers is minimal at the beginning and reaches the nominal value at the end of the loop. But the extrusion rate is fixed. This involves an obvious over-extrusion in the initial area of the loop, as showed in the attached video (youtube link).
Actually, the first layer starts over extruded and close the loop with the correct extrusion rate. I don't know if the slicer preview is able to highlight a change in the extrusion width with the color scale within a single layer. In the image, correctly, it does not show variations in the extrusion width of the seventh layer, which is the first in spiral vase mode. https://www.youtube.com/watch?v=sgMcxs-gj9A&feature=youtu.be

STL/Config (.ZIP) where problem occurs

Any object. Spiral vase.zip

FidelCapo commented 5 years ago

I think the problem may be in extrusion width values that are set to 0 (auto). This auto setup is not well tested and we plan to remove it to future versions. Why do you use this auto setting?

liftbag commented 5 years ago

This auto setup is not well tested and we plan to remove it to future versions. Why do you use this auto setting?

I'll report the results as soon as I can try with well-defined extrusion width values.

bubnikv commented 5 years ago

The issue was caused by the auto extrusion width. No further response, closing.

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