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Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Wed Oct 14, 2020 1:05 pm
by xnaron
What cases this squiggly wall on the 3dbenchy. Infill is set to 0%. See attached profile.

Screenshot 2020-10-14 110225.jpg

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Wed Oct 14, 2020 3:28 pm
by S3D-Jake
Can you please attach your factory file (Save Factory File As...)?

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Wed Oct 14, 2020 10:11 pm
by xnaron
It won't let me it says file too large. 4,407 KB is the size.

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Wed Oct 14, 2020 10:16 pm
by xnaron

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Thu Oct 15, 2020 6:28 am
by parallyze
xnaron wrote:
Wed Oct 14, 2020 10:16 pm
I put it on my google drive
xnaron wrote: What cases this squiggly wall on the 3dbenchy. Infill is set to 0%. See attached profile.
For some reason S3D is adding some infill for top/bottom layers on the inside of overhangs pretty fast.

You can change the amount of top/bottom layers and/or extrusion width/perimeter count to see some differences:
squiggly.JPG
squiggly_2.JPG
There's so many perimeters and so much overlap, I wonder why those parts of solid infill need to be there. On some
objects this can add a lot of print time without real benefits... :(

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Thu Oct 15, 2020 6:40 am
by parallyze
FWIW, this was also different in previous versions of S3D (<4.1):

Factory file from xnaron in S3D v4.0:
squiggly_3.JPG

Same file/settings in S3D v4.1.2:
squiggly_5.JPG

Reducing bottom layers from 5 down to 3 avoids this in 4.0 (v4.1.2 needs bottom layers set to 1):
squiggly_4.JPG

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Mon Nov 02, 2020 3:12 pm
by mrbodiddley
Hi there
I've just replyed to another older thread here: viewtopic.php?f=9&t=11780&e=1&view=unread#p57387
I'm using 4.1.2 as well and can't find a consitent way to work around this. With some objects it works by having nbr of bottom=perimeter, with others it has no effect. The uppside-down recommendation from above thread does also not work with all objects.

Did anyone reach out to support of S3D about this yet? I would if no one did so far.

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Tue Nov 03, 2020 9:34 am
by S3D-Alex
I think we have a couple other threads where this is covered in more detail so I have included the links below:

viewtopic.php?f=9&t=14020

viewtopic.php?f=9&t=13796

Basically when you are printing surfaces at an angle they create a stairstep. Each step of the stairs is a top or bottom of the part so it must satisfy the Top and Bottom Layer Settings you have. Dkightley does a great job describing this with his diagrams in the second link I included above.

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Tue Nov 03, 2020 11:55 am
by dkightley
I think this post of mine tells the story behind this issue :
viewtopic.php?f=9&t=14020&start=10

Re: Squiggly interior wall in front of inside perimeter on 3dBenchy

Posted: Tue Nov 03, 2020 4:46 pm
by mrbodiddley
Thank you guys - Trying to get my head around your explenations.

I'm trying to understand what the above and the graphs you guys created (viewtopic.php?f=9&t=13796&p=52184#p52168) mean for the model I use as an example.

In the cross section view I cant seem to see what you are explaining. What am I missing? Is it coincidence this starts building up where bridging happens on the outermost perimeter?
stairsteps-overhangs_UnexpectedSolidLayer2.jpg
This is the factory file:
Demo_WiredInside_No-Fix.factory
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