# Trouble with Extension "SurfaceWrapSolidify" 

**URL:** <https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331>\
**Category:** Support\
**Tags:** segmentation, extensions-manager\
**Created:** [March 12, 2023, 4:31pm UTC](https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331 "2023-03-12T16:31:19Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![German.Men.Rev](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/german.men.rev/32/18763_2.png) [@German.Men.Rev](https://discourse.slicer.org/u/German.Men.Rev)\
**Post date:** [March 12, 2023, 4:31pm UTC](https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331/1 "2023-03-12T16:31:19Z")

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Hi everybody 😀 , first time here on this forum. Hope I chose the right category.  
I was having some trouble with the Extension “SurfaceWrapSolidify” . It’s a pelvic CT with a superior pubic ramus fracture , and I think I must be doing something wrong when selecting the “Preserve cracks” option, since I’m getting a bridge of bone where a fracture lines should be ( Image attached)

 ![Captura de pantalla 2023-03-11 a las 14.52.13](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/6/b659065703354169c80269e1abe99ec247eeb28b.jpeg)

And also after exporting the segmented shell to Cura software I’m still getting only support structure on the inner space of the pelvic bone (purple arrow) instead of the infill I set up (100% infill , and 5% support density + line support pattern., and choosing 100% infill , and 5% support density + line support pattern.

 ![Captura de pantalla 2023-03-11 a las 15.42.21](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/3/9353db86d00bd49ac61cc1fd8c446d78607d1c73.jpeg)

Thanks in advance for any tips to get this right.

All best

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [March 12, 2023, 5:23pm UTC](https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331/2 "2023-03-12T17:23:14Z")

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To create a model for 3D printing that preserves cracks use “Model” output. The binary labelmap representation of a segmentation may not be able to preserve enough details that are needed for thin cracks.

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**Author:** ![tsehrhardt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tsehrhardt/32/18470_2.png) [@tsehrhardt](https://discourse.slicer.org/u/tsehrhardt)\
**Post date:** [March 13, 2023, 5:45pm UTC](https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331/3 "2023-03-13T17:45:55Z")

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For the 3D printing, because you created a shell in SurfaceWrapSolidify with a thickness, Cura is reading that as an outward facing surface basically. You can use SurfaceWrapSolidify to create a solid filled model–when you export the STL, it will be a hollow shell. Then in Cura, you can specify your infill and wall thickness or number of walls.

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**Author:** ![German.Men.Rev](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/german.men.rev/32/18763_2.png) [@German.Men.Rev](https://discourse.slicer.org/u/German.Men.Rev)\
**Post date:** [March 13, 2023, 6:36pm UTC](https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331/4 "2023-03-13T18:36:59Z")

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Thanks to you both. I’ll try to make it work 😀

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**Author:** ![German.Men.Rev](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/german.men.rev/32/18763_2.png) [@German.Men.Rev](https://discourse.slicer.org/u/German.Men.Rev)\
**Post date:** [March 14, 2023, 9:33pm UTC](https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331/5 "2023-03-14T21:33:04Z")

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Dear Terrie,

I tried it without clicking on the “create shell” option and got this beautiful solid segmentation ( screenshot number 1).

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/b/cb7c80aae0729fe337bdf3543ce0cbf22040a0ff.jpeg)

And now after exporting it to cura, I was able to control the inside of the pelvis with the infill and got the printing time down to 11h ( 5 h less than the last time) 😄 (screenshot number 2)

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/5/b55a668e12d6b9a015ebdf3f0da7195c19a69ff8.jpeg)

So now I was wondering , Is there a way I could get that nice solid segmentation and still preserve the fracture lines ( green arrow on screenshot number 3), because now they are kind of faded. Maybe something to do with the “split cavities” ?. The 3d model looks like a healed bone without visible fracture gaps.

PS: love your RibApp ! 🤩

 ![Captura de pantalla 2023-03-14 a las 22.22.07](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/5/d5dd9cdaf2b24ae69dd44658ba248592fe80e4a8.jpeg)

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<div class="post-metadata">

**Author:** ![tsehrhardt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tsehrhardt/32/18470_2.png) [@tsehrhardt](https://discourse.slicer.org/u/tsehrhardt)\
**Post date:** [March 15, 2023, 1:02pm UTC](https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331/6 "2023-03-15T13:02:19Z")

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You can adjust the “Carve Holes” to a smaller value like 5.0 mm to see if that gives you what you need. The default of 10mm seems to fill in everything. You might still end up with some holes that need filling.

Thanks for checking out my rib app! Hand bones are next! 😀

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<div class="post-metadata">

**Author:** ![German.Men.Rev](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/german.men.rev/32/18763_2.png) [@German.Men.Rev](https://discourse.slicer.org/u/German.Men.Rev)\
**Post date:** [March 17, 2023, 12:48pm UTC](https://discourse.slicer.org/t/trouble-with-extension-surfacewrapsolidify/28331/7 "2023-03-17T12:48:58Z")

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Thanks ! I’l try with 5.0mm