# Export Models as One STL after transformation

**URL:** <https://discourse.slicer.org/t/export-models-as-one-stl-after-transformation/47371>\
**Category:** Support\
**Created:** [June 17, 2026, 8:01pm UTC](https://discourse.slicer.org/t/export-models-as-one-stl-after-transformation/47371 "2026-06-17T20:01:02Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![jawdoc](https://avatars.discourse-cdn.com/v4/letter/j/74df32/32.png) [@jawdoc](https://discourse.slicer.org/u/jawdoc)\
**Post date:** [June 17, 2026, 8:01pm UTC](https://discourse.slicer.org/t/export-models-as-one-stl-after-transformation/47371/1 "2026-06-17T20:01:02Z")

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Greetings. I am a facial surgeon and fairly familiar with 3D Slicer. I have a quick question. So my goal is to take a mandible fracture, segment the fracture, and move the segments to their anatomic positions, which allows me to print a 3D model for titanium plate bending prior to surgery. I have segmented the rendering for each fracture segment and converted them to a model so I can transform or move them to reduce the fractures. Now I want to export multiple ~4 segments as a single STL. Is there a way I can combine the segments into a single STL for export?

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [June 17, 2026, 8:43pm UTC](https://discourse.slicer.org/t/export-models-as-one-stl-after-transformation/47371/2 "2026-06-17T20:43:36Z")

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One option would be to make one new segmentation for each segment so you can move them independently, then harden them, then copy them back into a single segmentation and then merge them all with the logical operators and then export the result as a single stl.

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**Author:** ![mikebind](https://avatars.discourse-cdn.com/v4/letter/m/71e660/32.png) [@mikebind](https://discourse.slicer.org/u/mikebind)\
**Post date:** [June 17, 2026, 9:01pm UTC](https://discourse.slicer.org/t/export-models-as-one-stl-after-transformation/47371/3 "2026-06-17T21:01:03Z")

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The “Dynamic Modeler” module’s “Append” tool should work perfectly for this. Probably you would need to harden your transforms before appending the models into a merged model, but you can test if this is necessary.

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**Author:** ![jawdoc](https://avatars.discourse-cdn.com/v4/letter/j/74df32/32.png) [@jawdoc](https://discourse.slicer.org/u/jawdoc)\
**Post date:** [June 17, 2026, 9:48pm UTC](https://discourse.slicer.org/t/export-models-as-one-stl-after-transformation/47371/4 "2026-06-17T21:48:01Z")

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Steve

I follow everything except how to copy the hardened segmentations into a new segment.  
Can you elaborate a little more on that?

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<div class="post-metadata">

**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [June 17, 2026, 10:29pm UTC](https://discourse.slicer.org/t/export-models-as-one-stl-after-transformation/47371/5 "2026-06-17T22:29:09Z")

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In the Segmentations module there’s a Copy/Move segments option.

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**Author:** ![jawdoc](https://avatars.discourse-cdn.com/v4/letter/j/74df32/32.png) [@jawdoc](https://discourse.slicer.org/u/jawdoc)\
**Post date:** [June 18, 2026, 12:43pm UTC](https://discourse.slicer.org/t/export-models-as-one-stl-after-transformation/47371/6 "2026-06-18T12:43:43Z")

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Mike… This worked perfectly! Thanks for the help!