CSG- Incompatible Instances

Good morning DevForum,
A few months ago, I discovered how you can make a hole in a part by negating and unioning a part. I’m trying to do that today with a union of 26 other parts, but it says “Selection contains CSG-Incompatible Instances”. I don’t have any decals on it. The union contains cylinders and squares. Can someone help me?

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Are they grouped? are they meshes?

No, they are a union. They are not meshes either.

Can you show us the picture so that we can understand what do you mean by that

fail

I think the part that you select is like a mesh… can you show the part that you created

part Here’s the part.

You cant union a model that’s the problem

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can you show us the property of the part

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I tried to group it instead of making it a union and it still isn’t working.

Is it a model you were trying to union?

Is this what you wanted?

Yes. Would I have to keep it as separate parts and then union it?

You cannot union models if you want to union it ungroup it then union

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Thank you so much for the help, I really appreciate it! Have a great day!

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