# Negative mold of an STL

**URL:** <https://discourse.slicer.org/t/negative-mold-of-an-stl/29669>\
**Category:** Support\
**Tags:** segmentation, 3d-model\
**Created:** [May 26, 2023, 11:45am UTC](https://discourse.slicer.org/t/negative-mold-of-an-stl/29669 "2023-05-26T11:45:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jf00](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jf00/32/66886_2.png) [@jf00](https://discourse.slicer.org/u/jf00)\
**Post date:** [May 26, 2023, 11:45am UTC](https://discourse.slicer.org/t/negative-mold-of-an-stl/29669/1 "2023-05-26T11:45:18Z")

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Hi. I have an stl file regarding the segmentation of part of the skull. Now, I need to create the negative mold to create a box mold similar to the figure. Anyone knows how to do it? My problem is the irregular shape of the bone. Thanks for the help.  
 ![Captura de ecrã 2023-05-25, às 17.23.37](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/9/b9c2dc48d7d586d477feb4b7689a8bcd28f3136d.png)  
 ![Captura de ecrã 2023-05-25, às 17.24.25](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/e/eeacbf3f731b559ab93100a46bc9ee74f4cdf9ff.png)

![Captura de ecrã 2023-05-25, às 17.13.49](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/9/79597ad82e026d3b5d55758805e38f4228586f50.png)