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Strange texture appearing on printed surface  

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Onverra
(@onverra)
New Member
Strange texture appearing on printed surface

Hi,

I downloaded a model from thingiverse, and printed it. A weird surface was noticeable all other the place.

I decided to isolate a small portion of it and try to understand what is happening... Spoiler alert... I failed.

Here the printed surface:

Once sliced with Slic3r 1.41.2, the texture can be seen in the Preview Tab:

I attached the obj file and gcode too.

Any idea of what is happening?

Thanks for any lead.

Laurent

Posted : 25/01/2019 12:39 am
Bunny Science
(@bunny-science)
Noble Member
Re: Strange texture appearing on printed surface

When I run that .obj through Slic3r, I see infill flipping on/off in those areas. Look through your slicer preview paths. I'll bet you see things flipping between infill and perimeter in those regions. The thickness of the part varies a bit with the low polygon part and that flips you between infill and perimeter.

Posted : 27/01/2019 12:24 am
Onverra
(@onverra)
New Member
Topic starter answered:
Re: Strange texture appearing on printed surface

Yes, I noticed the same. Is it the intended behavior on such fin part? If it is, fine, I'll make it thicker. If not, I might need to fill a bug in Slic#r?

Posted : 29/01/2019 4:35 pm
Bunny Science
(@bunny-science)
Noble Member
Re: Strange texture appearing on printed surface

It is not a bug, but normal behavior. The slicer looks for how much space exists between perimeters and if that exceeds some threshold, fills the gap with infill. The fin has small regions in its design that cross that threshold. The infill affects perimeter surface appearance and thus the texture.

Three ways around this normal behavior causing the texture change....

1. Increase number of perimeters to "fill in" the internal gaps.

2. Increase % infilll to nearly 100% - making the texture change area more encompassing.

3. Completely turn off infill for that part, but I don't know if that will leave enough strength

Posted : 29/01/2019 4:47 pm
Onverra
(@onverra)
New Member
Topic starter answered:
Re: Strange texture appearing on printed surface

Thanks Guy! That's make perfect sense!

Posted : 29/01/2019 5:02 pm
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