1 Topic by redbarret (edited by redbarret 2015-02-15 22:12:14)

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Topic: tiny gaps between perimeters?

I ran a complete recalibration of my Solidoodle 4 printer recently, and all seems correct and well except one thing.
The perimeters don't adhere to each other. No problem with bottom and top layers forming a solid bond or perimeter and infills with each other.
I took an exacto knife and could "peel off" the outermost perimeter from the inner one like taking off a coat. At first I thought I was underextruding, but I double checked and played around with the extrusion multiplier.
Doesn't seem to be the issue.
It feels as if Slic3r is intentionally leaving a 0.01mm gap between the perimeters.

Using Solidoodle's filament.

Does anyone recognize this situation and can guess what's going on?

https://i.imgur.com/xyVb234.jpg

Slic3r settings:

https://i.imgur.com/PT12lUD.png

https://i.imgur.com/8otcEl7.png

https://i.imgur.com/5yNFh0N.png

https://i.imgur.com/qssJwKr.png

https://i.imgur.com/YOW5Q5I.png

Solidoodle 4

2 Reply by wardjr

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Re: tiny gaps between perimeters?

Slightly decrease the extrusion width and see if that helps.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
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3 Reply by redbarret

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Re: tiny gaps between perimeters?

Thanks.
I expected to hear the opposite suggestion. Any explanation for this?

Solidoodle 4

4 Reply by wardjr

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Re: tiny gaps between perimeters?

Extrusion width is primarily the tool path.  Bringing the paths closer to one another should help with your problem.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

wardjr's Website

5 Reply by redbarret

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Re: tiny gaps between perimeters?

Interesting. I thought it determined the distance between the paths as much as the diameter of the extruded and squished plastic so changing would affect both equally.

Solidoodle 4

6 Reply by jagowilson (edited by jagowilson 2015-02-21 19:46:26)

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Re: tiny gaps between perimeters?

redbarret wrote:

Interesting. I thought it determined the distance between the paths as much as the diameter of the extruded and squished plastic so changing would affect both equally.

not quite, the plastic is actually supposed to overlap a tad for good bonding and strength. in new (experimental branch) versions of slic3r you can configure the overlap in the layers and perimeters tab i believe. the default overlap is 15% which is calculated from extrusion width, so 0.48*0.15 = 0.072mm of overlap. This is why lash can cause gaps at edges--the margin for error is much higher under 0.1mm.

7 Reply by wardjr

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Re: tiny gaps between perimeters?

You are right but it's not completly equal and it is a very easy test to perform.  If it doesn't help just switch it back.  If you go too small it will begin to overextrude.  It really is a work around for Slic3r's absence of a % overlap setting.  Witch I've heard is now included in the latest experimental release.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

wardjr's Website

8 Reply by redbarret

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Re: tiny gaps between perimeters?

jagowilson wrote:

not quite, the plastic is actually supposed to overlap a tad for good bonding and strength.

Oh right. So what does the "extrusion width" in the current stable release mean then? The diameter of the extruded plastic minus the extra added for overlapping/bonding?

I'm testing the differences out now. Just want to know what I'm doing.
Maybe you guys answered already, if yes then I apologize for not getting it.

Maybe I'll just switch to the latest experimental version and not worry about it too much.

Solidoodle 4

9 Reply by jagowilson (edited by jagowilson 2015-02-21 22:13:27)

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Re: tiny gaps between perimeters?

extrusion width is how big one thread of plastic is when squished onto the bed. the overlap is separate. if you set the overlap to 0 for example you'd have some spacing in between each line because you never get exactly your extrusion width due to things such as filament tolerance. the toolpath will call for it such that there should be *no* spacing, but it doesn't work out that way in reality.

10 Reply by redbarret

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Re: tiny gaps between perimeters?

Yeah, I mean the old versions where you can't set the overlap. I thought maybe you'd know.

Solidoodle 4