That issue you've just described looks as if its a slight inaccuracy in the shape. There's a very small triangle on the side of the shape that S3D is seeing and is successfully following the small shape difference......and Cura doesn't look as if its seeing it!
Re: Blobs in Vase Mode
I think you're being a bit too aggressive over S3d's performance when comparing it with Cura.
That issue you've just described looks as if its a slight inaccuracy in the shape. There's a very small triangle on the side of the shape that S3D is seeing and is successfully following the small shape difference......and Cura doesn't look as if its seeing it! In fact, looking at the whole shape, I'm wondering if there are many points where triangles meet that cause a wobbly outline when running round the circumference in a very fine spiral....and I wouldn't be surprised that its this that's causing S3D to change course so many times....and the resultant continuous extrusion goes slightly wrong. And.....doing the inevitable comparison with Cura, I'm guessing that Cura doesn't see the same changes in surface!...and hence appears to do a better job!
That issue you've just described looks as if its a slight inaccuracy in the shape. There's a very small triangle on the side of the shape that S3D is seeing and is successfully following the small shape difference......and Cura doesn't look as if its seeing it! In fact, looking at the whole shape, I'm wondering if there are many points where triangles meet that cause a wobbly outline when running round the circumference in a very fine spiral....and I wouldn't be surprised that its this that's causing S3D to change course so many times....and the resultant continuous extrusion goes slightly wrong. And.....doing the inevitable comparison with Cura, I'm guessing that Cura doesn't see the same changes in surface!...and hence appears to do a better job!
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net
Re: Blobs in Vase Mode
Okay here is another observation, and this is why you had no blobs. In 0.2mm Layer it looks much better.
This is exactly the same position and exactly the same setting except the layer height... this is curious and I think not the behavior you expect from a slicer. 0.4mm layer seems fine too... but 0.1mm layer is bad again
BUUUUUUGGGG 
This is exactly the same position and exactly the same setting except the layer height... this is curious and I think not the behavior you expect from a slicer. 0.4mm layer seems fine too... but 0.1mm layer is bad again
BUUUUUUGGGG
Re: Blobs in Vase Mode
Another Example. This time a more round vase: https://www.thingiverse.com/thing:1851632/#files
Look at this:
BUG, BUG, BUG
Look at this:
Re: Blobs in Vase Mode
Okay, especially on this vase it seems like the "bug" is gone @ 0.2mm Layer. But in reality the weird movements are present on the other side. So seems like the problem is always there but not on the same place.
Seems like the slicer is ignoring some facets depending on the layer setting and interpolates wrong between the intersecting facets
Seems like the slicer is ignoring some facets depending on the layer setting and interpolates wrong between the intersecting facets
