# Union - Boolean Operation Failed

**URL:** <https://discourse.shapr3d.com/t/union-boolean-operation-failed/33049>\
**Category:** Modeling Questions\
**Created:** [July 26, 2024, 7:07am UTC](https://discourse.shapr3d.com/t/union-boolean-operation-failed/33049 "2024-07-26T07:07:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Moshgra](https://avatars.discourse-cdn.com/v4/letter/m/e36b37/32.png) [@Moshgra](https://discourse.shapr3d.com/u/Moshgra)\
**Post date:** [July 26, 2024, 7:07am UTC](https://discourse.shapr3d.com/t/union-boolean-operation-failed/33049/1 "2024-07-26T07:07:34Z")

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I’m struggling to get what seems like a simple shape to union without a “Boolean operation failed” error. It’s a simple enough sketch that I can just start over, but I’ve been seriously struggling since the recent update with history sketches. I found out I should be selecting the sketch layer before continuing. However, this sketch was made through projecting multiple layers, that I accidentally made before realizing, onto one.

Unfortunately, I seem to have messed up something royally because I’m now unable to Union the bodies. Furthermore, when trying to trim the lines and just extrude as one piece, i get a new error “the face or sketch filling can’t be extruded because it would create a non-manifold body”

Hoping someone can help guide me on repairing this so I can fix it in the future if I ever have more complex shapes.

Processing: Screenshot 2024-07-25 115552.png…Processing: Screenshot 2024-07-25 115709.png…

 ![Screenshot 2024-07-25 115938](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/f/a/facf6b85a62aa9231f1de811591d494459e3a62a.jpeg)

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**Author:** ![jcclow](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/jcclow/32/23888_2.png) [@jcclow](https://discourse.shapr3d.com/u/jcclow)\
**Post date:** [July 26, 2024, 4:30pm UTC](https://discourse.shapr3d.com/t/union-boolean-operation-failed/33049/2 "2024-07-26T16:30:28Z")

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It might help if you shared the project.

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**Author:** ![Moshgra](https://avatars.discourse-cdn.com/v4/letter/m/e36b37/32.png) [@Moshgra](https://discourse.shapr3d.com/u/Moshgra)\
**Post date:** [July 27, 2024, 1:42pm UTC](https://discourse.shapr3d.com/t/union-boolean-operation-failed/33049/3 "2024-07-27T13:42:30Z")

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Yea I tried but as soon as I posted I got an error saying I’m a new user. Quite obnoxious that I need a separate login for the forum and despite using shape for years i’m a “new user” so I’m blocked from posting. I also had to wait for approval of my post so I just decided to start it over. If I can share it when I get back to my PC I think I still have the .shapr file of the issue in question.

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**Author:** ![JMastran](https://avatars.discourse-cdn.com/v4/letter/j/f04885/32.png) [@JMastran](https://discourse.shapr3d.com/u/JMastran)\
**Post date:** [July 28, 2024, 1:49pm UTC](https://discourse.shapr3d.com/t/union-boolean-operation-failed/33049/4 "2024-07-28T13:49:50Z")

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Check to ensure you have no gaps between the bodies you’re trying to union. If they aren’t touching, they won’t union.