# Prevent auto-merge of shapes?

**URL:** <https://discourse.shapr3d.com/t/prevent-auto-merge-of-shapes/751>\
**Category:** Modeling Questions\
**Created:** [February 6, 2017, 9:32am UTC](https://discourse.shapr3d.com/t/prevent-auto-merge-of-shapes/751 "2017-02-06T09:32:20Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![falsch](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/falsch/32/617_2.png) [@falsch](https://discourse.shapr3d.com/u/falsch)\
**Post date:** [February 6, 2017, 9:32am UTC](https://discourse.shapr3d.com/t/prevent-auto-merge-of-shapes/751/1 "2017-02-06T09:32:20Z")

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Hello,

I’m new to 3D modelling, so please excuse, if my question is stupid.

I watched all the tutorial videos now and think I understood everything. But I have a really hard time to figure out when Shapr3D merges shapes automatically together.

I create all my sketches like in the tutorial videos, then I create my first shape, rename the group, create and activate a new group (like mentioned in one of the tutorial videos), but then, if I create my second shape (which I create to substract it from the first one) shapr3d shows me “calculating” and if finished I have not two objects in two groups, but one in one group. So how to prevent this behaviour? Because I need two objects to subtract them from each other.

Thank you very much!

Ciao

alex

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**Author:** ![Gabor\_Shapr3D](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/gabor_shapr3d/32/235_2.png) [@Gabor\_Shapr3D](https://discourse.shapr3d.com/u/Gabor_Shapr3D)\
**Post date:** [February 6, 2017, 9:44am UTC](https://discourse.shapr3d.com/t/prevent-auto-merge-of-shapes/751/2 "2017-02-06T09:44:05Z")

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Hi Alex,

Can you post a video / screenshot of what you are trying to do?

Would be easier to understand what the problem is.

G

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**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\
**Post date:** [February 6, 2017, 3:13pm UTC](https://discourse.shapr3d.com/t/prevent-auto-merge-of-shapes/751/3 "2017-02-06T15:13:00Z")

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Tap on the label that shows the height of the extrusion. Then select the appropriate method from the 4 options on the top (fuse, cut, section, new object).

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**Author:** ![falsch](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/falsch/32/617_2.png) [@falsch](https://discourse.shapr3d.com/u/falsch)\
**Post date:** [February 9, 2017, 7:39am UTC](https://discourse.shapr3d.com/t/prevent-auto-merge-of-shapes/751/4 "2017-02-09T07:39:36Z")

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Thank you very much. That was exactly what I was looking for! 🕶

Now I have another question: How can I find the reason, why an “Intersect” throws an “operation failed”?

![](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex002/uploads/shapr3d/original/1X/4bf3bfdb25cb69b6abe3faf88647f9a3050590e2.PNG)

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**Author:** ![Tamas\_Shapr3D](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tamas_shapr3d/32/41_2.png) [@Tamas\_Shapr3D](https://discourse.shapr3d.com/u/Tamas_Shapr3D)\
**Post date:** [February 9, 2017, 10:22am UTC](https://discourse.shapr3d.com/t/prevent-auto-merge-of-shapes/751/5 "2017-02-09T10:22:24Z")

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A number of things can cause the intersection operation to fail. Please post some screenshots/videos or send me the workspace so I can take a look at it!