# Help? Non manifold body?

**URL:** <https://discourse.shapr3d.com/t/help-non-manifold-body/23818>\
**Category:** Modeling Questions\
**Created:** [January 28, 2023, 10:35pm UTC](https://discourse.shapr3d.com/t/help-non-manifold-body/23818 "2023-01-28T22:35:36Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Debcherk](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/debcherk/32/18872_2.png) [@Debcherk](https://discourse.shapr3d.com/u/Debcherk)\
**Post date:** [January 28, 2023, 10:35pm UTC](https://discourse.shapr3d.com/t/help-non-manifold-body/23818/1 "2023-01-28T22:35:36Z")

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I need some help. What is a non-manifold body? I just spent an hour drawing this design and it won’t let me extrude it.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/f/0/f0a9c30bac915a868c8bc0292bc08f4a568882f6.jpeg)

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**Author:** ![Stephen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/stephen/32/16350_2.png) [@Stephen](https://discourse.shapr3d.com/u/Stephen)\
**Post date:** [January 28, 2023, 11:08pm UTC](https://discourse.shapr3d.com/t/help-non-manifold-body/23818/2 "2023-01-28T23:08:31Z")

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I might be wrong, but it seems you have selected some edges at the top right part of the sketch which I think would prevent extrusion.

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**Author:** ![Debcherk](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/debcherk/32/18872_2.png) [@Debcherk](https://discourse.shapr3d.com/u/Debcherk)\
**Post date:** [January 28, 2023, 11:41pm UTC](https://discourse.shapr3d.com/t/help-non-manifold-body/23818/3 "2023-01-28T23:41:20Z")

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Google to the rescue! I found an old conversation in this forum on the same topic and realized that I had a triangle touching another shape at the corners. I deleted that and moved it over a little bit and it extruded perfectly. I feel so accomplished 😂

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**Author:** ![Stephen](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/stephen/32/16350_2.png) [@Stephen](https://discourse.shapr3d.com/u/Stephen)\
**Post date:** [January 29, 2023, 12:57am UTC](https://discourse.shapr3d.com/t/help-non-manifold-body/23818/4 "2023-01-29T00:57:18Z")

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Well done 👍