Extra perimeter created out of the part size

[gregsaun]

Version

PrusaSlicer 2.1.0+win64

Operating system type + version

Windows 10 Pro 64b build 18362

3D printer brand / version + firmware version (if known)

Bear Upgrade 2.1-dev from Prusa MK3S

Behavior

A hole close to the outside perimeters creates an extra perimeters outside the part. This might be linked to the elephant foot compensation.

If the hole is closer it could split this extra perimeters is several small perimeters.

The expected result is to have a very thin perimeter straight. The smallest thickness of this perimeter should be 0.5mm (cad) - 2* 0.2mm (elephant foot) = 0.1mm. If not printable then the perimeter should not exist.

Project File (.3MF) where problem occurs

ps210_bug_elephant_01.zip

[bubnikv]

I am working on an adaptive algorithm, that does not shrink parts narrower than two perimeter lines. This is the preliminary result for your model:

[gregsaun]

Thank you very much Vojtech!

So the idea is that elephant foot compensation does not shrink details that are smaller than 2 perimeters width? Why two and not one?

[bubnikv]

So the idea is that elephant foot compensation does not shrink details that are smaller than 2 perimeters width? Why two and not one?

1. Two is more conservative than one in regard to bed adhesion.
2. Any slicer I am aware of works primarily with closed curves, thus minimum two lines. Single line walls are usually detected after the closed curves.

The elephant foot compensation improvements are part of PrusaSlicer 2.2.0-alpha2. Closing.