# Clip vessel module creates non-flat cuts with ridges

**URL:** <https://discourse.slicer.org/t/clip-vessel-module-creates-non-flat-cuts-with-ridges/47536>\
**Category:** Support\
**Created:** [July 2, 2026, 10:00pm UTC](https://discourse.slicer.org/t/clip-vessel-module-creates-non-flat-cuts-with-ridges/47536 "2026-07-02T22:00:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sanjib\_Gurung](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sanjib_gurung/32/66199_2.png) [@Sanjib\_Gurung](https://discourse.slicer.org/u/Sanjib_Gurung)\
**Post date:** [July 2, 2026, 10:00pm UTC](https://discourse.slicer.org/t/clip-vessel-module-creates-non-flat-cuts-with-ridges/47536/1 "2026-07-02T22:00:54Z")

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Hi, I am trying to use 3D slicer to generate 3D models for CFD. I need to create flat ends to serve as inlets and outlets. In my current model, Clip vessel module is generating non-flat ends with ridges and need help solving the issue. Thanks!

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/7/07238bcab7d3238dabdd50cc35bfea6ce280f880.png)

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/5/55935de06ce42e72e0d2b3b31f6aec0b688c5a26.jpeg)

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**Author:** ![mau\_igna\_06](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mau_igna_06/32/9056_2.png) [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)\
**Post date:** [July 7, 2026, 12:50am UTC](https://discourse.slicer.org/t/clip-vessel-module-creates-non-flat-cuts-with-ridges/47536/2 "2026-07-07T00:50:06Z")

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As far as I can see, ClipVessels module does boolean operations internally. For that you can also use mesh boolean operations with [CombineModels](https://github.com/PerkLab/SlicerSandbox#combine-models) module of Sandbox extension. Do a difference operation against a box and you’ll get flat ends