# Creating a Volume from STL

**URL:** <https://discourse.slicer.org/t/creating-a-volume-from-stl/5144>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [December 19, 2018, 4:04pm UTC](https://discourse.slicer.org/t/creating-a-volume-from-stl/5144 "2018-12-19T16:04:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aleesdesigner](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@aleesdesigner](https://discourse.slicer.org/u/aleesdesigner)\
**Post date:** [December 19, 2018, 4:04pm UTC](https://discourse.slicer.org/t/creating-a-volume-from-stl/5144/1 "2018-12-19T16:04:49Z")

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I’m importing 2 STL files only in order to perform Boolean operations between the 2 models. How do I make one of those models the master volume so I can enable the editor? Thanks!

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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:** [December 19, 2018, 4:30pm UTC](https://discourse.slicer.org/t/creating-a-volume-from-stl/5144/2 "2018-12-19T16:30:18Z")

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Use latest nightly version and see this post for instructions: [3D model to segmentation](https://discourse.slicer.org/t/3d-model-to-segmentation/5135/2?u=lassoan)