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Strange behaviour with external perimeters (180 degree U-Turn) #206

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RomRider opened this issue Apr 22, 2020 · 3 comments
Closed

Strange behaviour with external perimeters (180 degree U-Turn) #206

RomRider opened this issue Apr 22, 2020 · 3 comments
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enhancement fix is live in the last release Please download /build the last release and try to reproduce. problem question

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@RomRider
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Version

2.2.49

Operating system type + version

MacOS 10.15.3

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

Ender 5 / Klipper

Behavior

I recently switched over to slic3r++ instead of Cura and started seeing strange layer lines on my prints (didn't happen with Cura). BTW, same speed, flow, retract, etc.. in Slic3r++ and Cura.

I tracked it down to slic3r++ making strange moves on perimeters. Going one way for one layer and then the other way in the middle of the line for the next layer.
Here is a gif of what I mean:

  • First layer: going counter clockwise
  • Second Layer: After the first perimeter line is drawn, it does a 180 turn and goes clockwise this time.

Apr-22-2020 22-26-33

Also with the same settings, Prusaslicer doesn't generate the same behavior (seam: aligned for example)

The result: First: Slic3r++ / Second: Cura (stopped the print, it was only for the purpose of this issue)
image
image

_

Project File (.3MF) where problem occurs

Slic3r++.3mf.zip
@supermerill
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The clockwise/counter-clockwise should only happen when the new perimeter has a part in an overhang area. I found that way it can print them more reliably.

This behavior is harming the surface quality? If yes i'll disable it or make it switchable.

@RomRider
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RomRider commented Apr 22, 2020 •
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There is no overhang on the gif (I think), I've attached the 3mf file to the post if you want to have a look.
It's definitely harming (at least for me), the pressure after the 180 turn is probably higher and thus creating those strange lines.
Making it optional would probably help a lot :)

supermerill added a commit that referenced this issue May 12, 2020
@supermerill
#206 reverse direction on overhang overhaul:
3d5ddd6 
 - now has a setting & a threshold
 - when reverse_direction trigger on the external loop, it also trigger for all other loops on this side (so, no more U-turn)
 - do not depends on extra_perimeter anymore
 - now extra_perimeters split into extra_perimeters (the old useless one) and extra_perimeters_overhangs
 - reordering settings in the tab.
@supermerill supermerill added the fixed for the next version That means that you should be able to test it in the latest nightly build label May 13, 2020
@RomRider
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Thanks so much :)

@supermerill supermerill mentioned this issue May 31, 2020
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@supermerill supermerill added fix is live in the last release Please download /build the last release and try to reproduce. and removed fixed for the next version That means that you should be able to test it in the latest nightly build labels Jun 3, 2020
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@supermerill @RomRider