# Extruding not Substracting as it Always did

**URL:** <https://discourse.shapr3d.com/t/extruding-not-substracting-as-it-always-did/36960>\
**Category:** Modeling Questions\
**Created:** [March 11, 2025, 7:39am UTC](https://discourse.shapr3d.com/t/extruding-not-substracting-as-it-always-did/36960 "2025-03-11T07:39:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![thealejandro](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/thealejandro/32/11542_2.png) [@thealejandro](https://discourse.shapr3d.com/u/thealejandro)\
**Post date:** [March 11, 2025, 7:39am UTC](https://discourse.shapr3d.com/t/extruding-not-substracting-as-it-always-did/36960/1 "2025-03-11T07:39:07Z")

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I am trying to create a recess in a threaded tube (internal thread).  
I draw a circle the size of the recess I need in different ways, but none are working as expected.

1. on the objects face
2. on a plane flush with the face I need to recess
3. on a plane distant from the face I need to recess

Instead of recessing (substracting body), a new body is created.

When I reach a certain distance (larger than the recess I need, it starts working as it should. Why not right from the surface of the body?

Help please! 🙂

[https://support.shapr3d.com/hc/en-us/requests/new](https://support.shapr3d.com/hc/en-us/requests/new)

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**Author:** ![TheBum](https://avatars.discourse-cdn.com/v4/letter/t/eada6e/32.png) [@TheBum](https://discourse.shapr3d.com/u/TheBum)\
**Post date:** [March 11, 2025, 6:18pm UTC](https://discourse.shapr3d.com/t/extruding-not-substracting-as-it-always-did/36960/2 "2025-03-11T18:18:37Z")

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There’s a tiny menu icon that pops up when you start the extrude. Click on it and select Subtract.

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**Author:** ![Lester](https://avatars.discourse-cdn.com/v4/letter/l/b9e5f3/32.png) [@Lester](https://discourse.shapr3d.com/u/Lester)\
**Post date:** [March 15, 2025, 7:47pm UTC](https://discourse.shapr3d.com/t/extruding-not-substracting-as-it-always-did/36960/3 "2025-03-15T19:47:18Z")

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When you are attempting to create the “Recess”, will the recessed bit also have internal threads, or will those threads be removed with the recess leaving smooth internal walls?

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**Author:** ![thealejandro](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/thealejandro/32/11542_2.png) [@thealejandro](https://discourse.shapr3d.com/u/thealejandro)\
**Post date:** [March 17, 2025, 4:30pm UTC](https://discourse.shapr3d.com/t/extruding-not-substracting-as-it-always-did/36960/4 "2025-03-17T16:30:59Z")

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Thank you very much, there was a little irregularity in the drawing that was not allowing extrusion…