1 Topic by KD

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Topic: Slic3r 1.0.0RC3 and support material

I installed this version and when using support material, it adds support material outside the part not just inside the part as previous version did.
For example, I have a 20mm square cross hole between two parallel surfaces, it adds material to support the inside of the hole and on both parallel faces extending out 2-3mm and the width of the hole. This adds to additional trimming, wasted material, and adds to the print time.
Have tried different settings in the support material panel to no avail.
Is there a setting in Slicer to not have the added support outside the part?

2 Reply by wardjr

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Re: Slic3r 1.0.0RC3 and support material

If it's inside the part it is infill.  Outside is support.  You can turn support off in Slic3r profile in support tab. Infill can be changed in the infill section of your profile. Infill can range from zero to one (one being solid).

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3 Reply by KD

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Re: Slic3r 1.0.0RC3 and support material

The support material I'm referring to is on the outside of the part on vertical walls. There are no overhangs to support, just cross holes and the previously mentioned 20 mm opening. It does add support material in the 20mm opening that allows the top surface to be built as expected.

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4 Reply by wardjr

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Re: Slic3r 1.0.0RC3 and support material

KD wrote:

The support material I'm referring to is on the outside of the part on vertical walls. There are no overhangs to support, just cross holes and the previously mentioned 20 mm opening. It does add support material in the 20mm opening that allows the top surface to be built as expected.

You need to turn support off in your profile.  Even though that support is inside a hole it is still considered out side the model.  I am not sure why Slic3r would choose to put support there either way though.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
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5 Reply by KD

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Re: Slic3r 1.0.0RC3 and support material

It didn't do this in previous versions of slicer. When supports were turned on and depending on the size of hole or opening, it would add support to the ID only. So far, I don't see a correlation to any settings in supports for the amount or size that are added.

If you turn on supports, do you see the supports added in this manner?

6 Reply by wardjr

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Re: Slic3r 1.0.0RC3 and support material

I avoid using support at all costs for exactly this reason.  It can be unpredictable so it's just easier to design around it or design it into the model.  What happens when you just turn off support?  It shouldn't be needed for what you showed above.

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7 Reply by KD

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Re: Slic3r 1.0.0RC3 and support material

Haven't tried it again. Will later this afternoon.
I had left support on all the time and let Slicer determine if any was needed. Will turn it off.

8 Reply by mdrVB6 (edited by mdrVB6 2014-05-09 19:54:12)

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Re: Slic3r 1.0.0RC3 and support material

I've had the same issue.  I need supports tuned on for the outer structure of a piece, but then it fills in my screw holes too where supports are really not needed.  I'm actually running slic3r 1.1.1 experimental and it does the same thing. 

So far as I can tell there is no way to get it to differentiate.  We should all email slic3r support/ feedback and respectfully mention to them that this does not work well.  They seem to update the software fairly regularly so hopefully it gets worked out but I think we are just SOL until then.

Edit: this is in addition to the other issue with slic3r 1.1.1 supports- they are too close (touching) the adjacent vertical walls in many cases.  This thread on github forums shows a lot of people not happy with this: https://github.com/alexrj/Slic3r/issues/1539

Basically, slic3r 0.9 was the last good version for supports. 1.0 and up has pillar supports that are nice but still very buggy.  Keep waiting for these to get fixed and consider staying with 0.9 for now.  I am rolling back to 0.9.

UPDATE: Slic3r 1.1.2 is out now (5/9/14) and they have fixed both issues!  It no longer generates supports through your screw holes and the pillar supports are no longer touching the adjacent vertical surfaces!

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