# 3D volume of the upper airways in STL file

**URL:** <https://discourse.slicer.org/t/3d-volume-of-the-upper-airways-in-stl-file/20212>\
**Category:** Support\
**Tags:** stl, 3d-model\
**Created:** [October 18, 2021, 6:58pm UTC](https://discourse.slicer.org/t/3d-volume-of-the-upper-airways-in-stl-file/20212 "2021-10-18T18:58:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Rebecca\_Napolitano](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rebecca_napolitano/32/12343_2.png) [@Rebecca\_Napolitano](https://discourse.slicer.org/u/Rebecca_Napolitano)\
**Post date:** [October 18, 2021, 6:58pm UTC](https://discourse.slicer.org/t/3d-volume-of-the-upper-airways-in-stl-file/20212/1 "2021-10-18T18:58:00Z")

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We created a 3D volume of the upper airways with “grow from seeds”. We wanted to export the volume in stl. When we try to do export the volume, we obtain only the four line of the “paint” and not the entire volume. How can we export the entire volume of the upper airways in STL file?

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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:** [October 18, 2021, 7:15pm UTC](https://discourse.slicer.org/t/3d-volume-of-the-upper-airways-in-stl-file/20212/2 "2021-10-18T19:15:23Z")

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Probably you missed the last step, which is to click the “Apply” button in the grow from seeds tool. It’s a common issue, and maybe the interface can be improved so that it’s less likely to happen. But once you learn it you’ll probably have no problem in the future.