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Oscillating wall thickness for thin walls, where the gap fill triggers in periodically. #149

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sh4jonny opened this Issue Feb 22, 2017 · 10 comments

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@sh4jonny

last version - Slic3r-1.33.8-prusa3d-win64-full-201702210907
windows 8.1 Pro x64 with last updates

slice a popular model hair lion from http://www.thingiverse.com/

http://www.thingiverse.com/thing:2007221

and have this troubles

cbxnhon5yrw
yjau2j4dhc8

in slic3r 1.2.9 didn't see it.

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bubnikv Feb 22, 2017

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Disable "detect thin walls" feature, it will print the perimeter with two lines.

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bubnikv commented Feb 22, 2017

Disable "detect thin walls" feature, it will print the perimeter with two lines.

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bubnikv Feb 22, 2017

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This is not really a bug of Slic3r, it is a result of your printer (likely a 0.5mm nozzle?) and the way Slic3r tries to squeeze one or two lines into the ring. You are on the threshold of placing 1 or two lines. Normally you would modify the model, but I suppose you have no access to it. You may also increase or decrease the external perimeter extrusion width to move away from the threshold a bit.

I agree the current behavior is not ideal and it is on my list to do something about it.

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bubnikv commented Feb 22, 2017

This is not really a bug of Slic3r, it is a result of your printer (likely a 0.5mm nozzle?) and the way Slic3r tries to squeeze one or two lines into the ring. You are on the threshold of placing 1 or two lines. Normally you would modify the model, but I suppose you have no access to it. You may also increase or decrease the external perimeter extrusion width to move away from the threshold a bit.

I agree the current behavior is not ideal and it is on my list to do something about it.

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sh4jonny Feb 22, 2017

thank you!
but i have 2 slicers with common profiles. yes nozzle is 0.4. external perimeter is 0.4 and internal 0.5 detect thin walls is enabled in both slicers. but in slic3r 1.2.9 i didn't see any troubles on wall

thank you!
but i have 2 slicers with common profiles. yes nozzle is 0.4. external perimeter is 0.4 and internal 0.5 detect thin walls is enabled in both slicers. but in slic3r 1.2.9 i didn't see any troubles on wall

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bubnikv Feb 22, 2017

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Would you please provide a screenshot of the layers generated by 1.2.9?

I don't think 1.2.9 is better in this regard, it is just different.

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bubnikv commented Feb 22, 2017

Would you please provide a screenshot of the layers generated by 1.2.9?

I don't think 1.2.9 is better in this regard, it is just different.

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sh4jonny Feb 22, 2017

and ugly preview
image

and ugly preview
image

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bubnikv Feb 22, 2017

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It is the same issue as discussed here:
http://shop.prusa3d.com/forum/print-tips-slic3r-settings-kisslicer-model-repair--f12/give-up-and-bite-the-bullet-pay--t3005.html

image

image

Here is my quite long description of what's going on:
http://shop.prusa3d.com/forum/print-tips-slic3r-settings-kisslicer-model-repair--f12/give-up-and-bite-the-bullet-pay--t3005-s30.html#p24021

I am going to leave your issue here as a topic for improvement, and rename the title. Thanks for the report.

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bubnikv commented Feb 22, 2017

It is the same issue as discussed here:
http://shop.prusa3d.com/forum/print-tips-slic3r-settings-kisslicer-model-repair--f12/give-up-and-bite-the-bullet-pay--t3005.html

image

image

Here is my quite long description of what's going on:
http://shop.prusa3d.com/forum/print-tips-slic3r-settings-kisslicer-model-repair--f12/give-up-and-bite-the-bullet-pay--t3005-s30.html#p24021

I am going to leave your issue here as a topic for improvement, and rename the title. Thanks for the report.

@bubnikv bubnikv added the enhancement label Feb 22, 2017

@bubnikv bubnikv changed the title from Slice bug to Oscillating wall thickness for thin walls, where the gap fill triggers in periodically. Feb 22, 2017

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sh4jonny Feb 22, 2017

@bubnikv thank you for support!

@bubnikv thank you for support!

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bubnikv Jun 2, 2017

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Another example of the issue is attached to #308

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bubnikv commented Jun 2, 2017

Another example of the issue is attached to #308

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ahalekelly Jun 8, 2017

Reposting this from #340. Seems to be that this tapered wall is thin enough to qualify as a thin wall, but for some reason only at certain Z heights.
image

Reposting this from #340. Seems to be that this tapered wall is thin enough to qualify as a thin wall, but for some reason only at certain Z heights.
image

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