# Union "The Boolean operation failed." error

**URL:** <https://discourse.shapr3d.com/t/union-the-boolean-operation-failed-error/25499>\
**Category:** Modeling Questions\
**Created:** [April 27, 2023, 1:49am UTC](https://discourse.shapr3d.com/t/union-the-boolean-operation-failed-error/25499 "2023-04-27T01:49:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jcm10](https://avatars.discourse-cdn.com/v4/letter/j/dc4da7/32.png) [@jcm10](https://discourse.shapr3d.com/u/jcm10)\
**Post date:** [April 27, 2023, 1:49am UTC](https://discourse.shapr3d.com/t/union-the-boolean-operation-failed-error/25499/1 "2023-04-27T01:49:30Z")

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I am trying to union these two bodies together (the grey with the black outline near the bottom with the rest of the part) but getting an error that says, “The Boolean operation failed.”  
What am I doing wrong and how do I fix it?

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/6/0/6066a99f6156a805fd579c27c5e8e9ffab14ece5.png)

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**Author:** ![Laci\_K](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/laci_k/32/8196_2.png) [@Laci\_K](https://discourse.shapr3d.com/u/Laci_K)\
**Post date:** [April 27, 2023, 6:05am UTC](https://discourse.shapr3d.com/t/union-the-boolean-operation-failed-error/25499/2 "2023-04-27T06:05:35Z")

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You can only union bodies that touch / intersect eachother.

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**Author:** ![jcm10](https://avatars.discourse-cdn.com/v4/letter/j/dc4da7/32.png) [@jcm10](https://discourse.shapr3d.com/u/jcm10)\
**Post date:** [April 27, 2023, 8:16pm UTC](https://discourse.shapr3d.com/t/union-the-boolean-operation-failed-error/25499/3 "2023-04-27T20:16:41Z")

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Yes, they do touch and interact. I used the pen tool to outline a hole and extruded to fill it. It worked for all but 2 holes.

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**Author:** ![Laci\_K](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/laci_k/32/8196_2.png) [@Laci\_K](https://discourse.shapr3d.com/u/Laci_K)\
**Post date:** [April 27, 2023, 8:17pm UTC](https://discourse.shapr3d.com/t/union-the-boolean-operation-failed-error/25499/4 "2023-04-27T20:17:17Z")

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In this case, please open a support ticket and attach the file, we can investigate the problem.