i used simplify 3d to repair my stl and then meshmixer to slice an stl into
2 mm slices. I then exported one slice into openscad.

F6 works fine but projection() has been problematic. If I use cut=true then
I get a no top level geometry error. If I use cut=false it just takes about
an hourto process.

Attached are a couple stl file examples layer1.stl
http://forum.openscad.org/file/n11117/layer1.stl  layer2.stl
http://forum.openscad.org/file/n11117/layer2.stl  layer4.stl
http://forum.openscad.org/file/n11117/layer4.stl

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thank you! that did the trick, translate([0,0,-2]) did the trick.

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so strangely enough, i tried the same stl file without repairing it with
simplify3D and the same code to run the projection() script and now it
doesn't work.

when I used simplify3D to repair, the projection(), translate() script
works. I think the issue is with the stl file.

Just something to ponder on.

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Hi Marius,

Thank you again for providing support on this community. Attached is the stl
file.  simplify_repaired_model.stl
http://forum.openscad.org/file/n11142/simplify_repaired_model.stl

I'll start from the beginning

1. Import an STL file in simplify 3d, repair it, and then export it as an
   stl
2. Import into Autodesk Meshmixer
3. Edit-> make slices --> Method:stacked 3d, direction : Y, thickness:2mm,
4. Export each sliced layer as an stl.
5. Import each sliced layer as an stl into openscad.
6. Run the projection(cut=true) translate([0,0, -z]) import("yourstl")
7. export to dxf

A new problem is that the sliced layers are filled where there should be an
empty space. ie. a hole becomes filled.

And sometimes I get the no top level geometry error which I was able to
resolve with translate([0,0,-z])

I did try using Autodesk123D make. It can export to dxf but in some layers
it will cut the stl into separate parts and it will not allow me to control
the slice layer thickness.

Next, I may try to use Blender to export to dxf. I'm not too familiar with
blender so that's a challenge for another day.

I'll keep digging at this problem. Hopefully, this will benefit others.

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Hi,

Thanks for the STL file. I think you’re hitting the same projection bug as this: https://github.com/openscad/openscad/issues/1130
It looks like a bug in an underlying library - I’ve sent a bug report, so let’s see if I get any feedback.

-Marius

son of a gun, i think you are right. that explains a whole lot.

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