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Why is slicer filling in holes

Posted by Beoga 
Why is slicer filling in holes
March 09, 2014 02:03PM
Using Repetier mac 0.56 and latest Slic3r 1.0.0RC3
When I place the object it looks fine.
When I slice it fills in holes that are present in the STL file.
Print obviously follows and fills them in.
Any ideas?
Attachments:
open | download - Screen Shot 2014-03-09 at 17.53.56.png (16.8 KB)
open | download - Screen Shot 2014-03-09 at 17.53.24.png (98.1 KB)
Re: Why is slicer filling in holes
March 09, 2014 02:08PM
When placing the file in Slic3r, is the file manifold? If not, then Slic3r may be "fixing" the file and automatically closing those holes.
Re: Why is slicer filling in holes
March 09, 2014 02:34PM
thanks KingRahl.
Im very new to this so had to lookup manifold.
Im using Sketchup to create the part and exporting STL file.
I just tried netfabb, the online cloud service for repairing the file but I had the same problem.
Is there a way of telling if the file is manifold.
Re: Why is slicer filling in holes
March 09, 2014 03:26PM
In Sketchup, the two holes that vanished are not 100% through both outer surfaces. If they were created with a "push", try pushing a bit further to break through the far side.....
Re: Why is slicer filling in holes
March 09, 2014 03:30PM
Looking at the first picture, it also appears that you may have moved the right side holes and that move wasn't reflected on the top surface.....
Re: Why is slicer filling in holes
March 09, 2014 06:01PM
Thanks Vreihen,
Im confident I am pushing fully through in Sketchup. If I draw something behind the holes I can see through them.
If I push further I extrude a projection on the opposite side.
I tried deleting and redrawing but the same problem occurred.
I just deleted and redrew again and this time its ok. Sliced image matches the stl image.
Very strange.
I must be doing something very subtle with pushing that I cannot spot.
Re: Why is slicer filling in holes
March 09, 2014 08:06PM
Quote
Beoga
thanks KingRahl.
Im very new to this so had to lookup manifold.
Im using Sketchup to create the part and exporting STL file.
I just tried netfabb, the online cloud service for repairing the file but I had the same problem.
Is there a way of telling if the file is manifold.

While in Slic3r, in the "Plater" window, on the bottom right, all the info about the file is there. Manifold: will say Yes if it is. If not, it may say Auto-repaired (xxxxx errors)
Re: Why is slicer filling in holes
March 09, 2014 08:19PM
I went through the same exact grief with Sketchup and the STL export plugin a few weeks ago, trying to draw a NEMA 17 motor mount plate. At one point, I pushed a hole through the top surface and a few extra mm higher, and then went back and deleted the projecting lines/circle that were hovering above the top surface. Some of my holes went through, and some didn't.....
Re: Why is slicer filling in holes
March 10, 2014 01:49AM
Can you post the .skp file?


_______________________________________
Waitaki 3D Printer
Re: Why is slicer filling in holes
March 10, 2014 03:53AM
Thanks folks,
KingRahl, I was using Repetier so didn't see the plater info. I think it lists errors on Repetier when you slice but you need to scroll back, I can see it now when I run Slic3r alone.
Waitaki, Unfortunately once I got it working on the recent redraw I saved it so the skp file is now 'fixed'. No doubt it will happen again.
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