# Non-Manifold

**URL:** <https://discourse.shapr3d.com/t/non-manifold/24667>\
**Category:** Modeling Questions\
**Created:** [March 10, 2023, 6:45am UTC](https://discourse.shapr3d.com/t/non-manifold/24667 "2023-03-10T06:45:33Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Bold](https://avatars.discourse-cdn.com/v4/letter/b/db5fbb/32.png) [@Bold](https://discourse.shapr3d.com/u/Bold)\
**Post date:** [March 10, 2023, 6:45am UTC](https://discourse.shapr3d.com/t/non-manifold/24667/1 "2023-03-10T06:45:33Z")

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Can anyone find the sketch that is causing the nonmanifold edge? I am trying to extrude the black pixels but I cannot because it is saying it will cause a non-manifold edge. Thanks.

https://collaborate.shapr3d.com/v/XqX5Jcdn1uVkDv8-IPAoq

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**Author:** ![KPeter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/kpeter/32/7644_2.png) [@KPeter](https://discourse.shapr3d.com/u/KPeter)\
**Post date:** [March 10, 2023, 10:00am UTC](https://discourse.shapr3d.com/t/non-manifold/24667/2 "2023-03-10T10:00:38Z")

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Hello there!  
The non-manifold state means that somewhere there would be an opening or a zero thickness issue on the body.

Could it be that you are trying to extrude two rectangles that are connected only by one of their corner points?

ps.: next time please share the Shapr3D design after exporting it, the Webviewer does not show sketches.

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**Author:** ![Oregonerd](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/oregonerd/32/8012_2.png) [@Oregonerd](https://discourse.shapr3d.com/u/Oregonerd)\
**Post date:** [March 10, 2023, 5:21pm UTC](https://discourse.shapr3d.com/t/non-manifold/24667/3 "2023-03-10T17:21:21Z")

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A forum search brought up this thread which suggest using Meshmixer. [Non-manifold detection](https://discourse.shapr3d.com/t/non-manifold-detection/13612)

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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:** [March 11, 2023, 1:59pm UTC](https://discourse.shapr3d.com/t/non-manifold/24667/4 "2023-03-11T13:59:22Z")

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Hi Bold. Welcome to the forum. Upload the project please so we can check the sketches for you.

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**Author:** ![Bold](https://avatars.discourse-cdn.com/v4/letter/b/db5fbb/32.png) [@Bold](https://discourse.shapr3d.com/u/Bold)\
**Post date:** [March 12, 2023, 4:50pm UTC](https://discourse.shapr3d.com/t/non-manifold/24667/5 "2023-03-12T16:50:07Z")

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Im not sure how to attach a Shapr3D file to this thread - it wouldn’t let me because I am a new user.

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**Author:** ![KPeter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/kpeter/32/7644_2.png) [@KPeter](https://discourse.shapr3d.com/u/KPeter)\
**Post date:** [March 13, 2023, 7:48am UTC](https://discourse.shapr3d.com/t/non-manifold/24667/6 "2023-03-13T07:48:04Z")

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No problem, I just upgraded your status so you should be allowed to upload