# Creating Internal Structures in bodies

**URL:** <https://discourse.shapr3d.com/t/creating-internal-structures-in-bodies/36703>\
**Category:** Modeling Questions\
**Created:** [February 24, 2025, 1:47am UTC](https://discourse.shapr3d.com/t/creating-internal-structures-in-bodies/36703 "2025-02-24T01:47:38Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![johnmasonsmith](https://avatars.discourse-cdn.com/v4/letter/j/7bcc69/32.png) [@johnmasonsmith](https://discourse.shapr3d.com/u/johnmasonsmith)\
**Post date:** [February 24, 2025, 1:47am UTC](https://discourse.shapr3d.com/t/creating-internal-structures-in-bodies/36703/1 "2025-02-24T01:47:38Z")

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Hi Shapr 3d community!

I’ve been using Shapr3D continuously for almost a year. But I haven’t found any help with this particular design need. I did find a YouTube video called “introduction to inner structure” using Fusion 360. It is essentially what I am needing to do.

I am making an aerodynamic wing of sorts, and it needs to be perfectly balanced. I cannot trust infill to do the job. I want to form a truss inside a solid body.

In an attempt to replicate the process illustrated in the video listed above I used a shell command with an intersect. the intersect did form the truss as I wanted but when I performed the union command the truss simply disappeared. If I do not use the union command. It will export into 3MF but when I slice it Orca simply ignores the extra structure.

Any help in this will be much appreciated.

Thanks John

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**Author:** ![TheBum](https://avatars.discourse-cdn.com/v4/letter/t/eada6e/32.png) [@TheBum](https://discourse.shapr3d.com/u/TheBum)\
**Post date:** [February 24, 2025, 1:55am UTC](https://discourse.shapr3d.com/t/creating-internal-structures-in-bodies/36703/2 "2025-02-24T01:55:19Z")

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Did you try creating one sketch for each truss and then extruding them after creating the wing? Make sure the extrudes are created as new bodies.

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**Author:** ![SCALEMODEL](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@SCALEMODEL](https://discourse.shapr3d.com/u/SCALEMODEL)\
**Post date:** [February 24, 2025, 3:25am UTC](https://discourse.shapr3d.com/t/creating-internal-structures-in-bodies/36703/3 "2025-02-24T03:25:04Z")

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Are you experiencing this issue?

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/f/f/ff79aa627e002cbabf3d94669e55ccfa188986bc.jpeg)

If you export from Shapr as STL you do not have to union.

Same file non unioned STL instead of 3MF.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/a/c/ac6151fc976c6fbd29e19c20519eabe89f5e3da2.jpeg)

Wing in Shapr

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/4/c/4c4cf4669395931d0f8f5b9b4a5142782e008465.jpeg)

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**Author:** ![johnmasonsmith](https://avatars.discourse-cdn.com/v4/letter/j/7bcc69/32.png) [@johnmasonsmith](https://discourse.shapr3d.com/u/johnmasonsmith)\
**Post date:** [February 24, 2025, 3:37pm UTC](https://discourse.shapr3d.com/t/creating-internal-structures-in-bodies/36703/4 "2025-02-24T15:37:25Z")

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Yes, Thanks ScaleModel, using STL works!

However, Now the problem is that when I print with support, which is needed on the build plate, it builds support within the cavity, not needed and not good.

Still trying options, let me know if you have any further suggestions.

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**Author:** ![johnmasonsmith](https://avatars.discourse-cdn.com/v4/letter/j/7bcc69/32.png) [@johnmasonsmith](https://discourse.shapr3d.com/u/johnmasonsmith)\
**Post date:** [February 24, 2025, 4:14pm UTC](https://discourse.shapr3d.com/t/creating-internal-structures-in-bodies/36703/5 "2025-02-24T16:14:50Z")

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The problem with support being built inside the body was resolved by making the truss slight larger so it came in contact with the outer wall. No support, no problem.  
John

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<div class="post-metadata">

**Author:** ![SCALEMODEL](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@SCALEMODEL](https://discourse.shapr3d.com/u/SCALEMODEL)\
**Post date:** [February 24, 2025, 4:40pm UTC](https://discourse.shapr3d.com/t/creating-internal-structures-in-bodies/36703/6 "2025-02-24T16:40:10Z")

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You have controls in ORCA for supports to be printed or not, as long as Truss is around 45degree you can turn off supports, if it’s automatically added for you.

If you need supports for printing reasons you can model the supports yourself so they break away and turn support off, add more brims if its needed as well.