# I think I found a bug while doing an extrusion

**URL:** <https://discourse.shapr3d.com/t/i-think-i-found-a-bug-while-doing-an-extrusion/6265>\
**Category:** Modeling Questions\
**Created:** [December 18, 2019, 12:13pm UTC](https://discourse.shapr3d.com/t/i-think-i-found-a-bug-while-doing-an-extrusion/6265 "2019-12-18T12:13:46Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Pepe](https://avatars.discourse-cdn.com/v4/letter/p/4da419/32.png) [@Pepe](https://discourse.shapr3d.com/u/Pepe)\
**Post date:** [December 18, 2019, 12:13pm UTC](https://discourse.shapr3d.com/t/i-think-i-found-a-bug-while-doing-an-extrusion/6265/1 "2019-12-18T12:13:46Z")

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I have faced this issue while tried to extrude from a surface on top of a cone shape. It should go straight up with no cone shape but it cannot do it without continuing the cone. This pisses me hugely. I cannot even sketch a circle on that top surface and extrude that without it getting cone shaped.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/d/dfb5917a5a475ae117321fe2090b000558585bf8.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/a/ad415ee7daba5aae6812e5b704076f072853b978.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/d/ded720509f36fcc6fa30901e228e3acc9b405841.jpeg)

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**Author:** ![Pepe](https://avatars.discourse-cdn.com/v4/letter/p/4da419/32.png) [@Pepe](https://discourse.shapr3d.com/u/Pepe)\
**Post date:** [December 18, 2019, 12:17pm UTC](https://discourse.shapr3d.com/t/i-think-i-found-a-bug-while-doing-an-extrusion/6265/2 "2019-12-18T12:17:20Z")

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I found a solution: if you hide the cone body, after sketching that circle on top of it, it doesn’t make it cone shaped anymore. But yeah, definitely not something I wanna do everytime.

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**Author:** ![Victor\_Shapr3D](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/victor_shapr3d/32/3502_2.png) [@Victor\_Shapr3D](https://discourse.shapr3d.com/u/Victor_Shapr3D)\
**Post date:** [December 18, 2019, 12:38pm UTC](https://discourse.shapr3d.com/t/i-think-i-found-a-bug-while-doing-an-extrusion/6265/3 "2019-12-18T12:38:17Z")

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Hi Pepe, it’s great to know that you found a solution. I will pass on your feedback to our development team and we will further look into this. Thank you for your understanding.

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**Author:** ![Dave\_P](https://avatars.discourse-cdn.com/v4/letter/d/43a26b/32.png) [@Dave\_P](https://discourse.shapr3d.com/u/Dave_P)\
**Post date:** [December 18, 2019, 1:07pm UTC](https://discourse.shapr3d.com/t/i-think-i-found-a-bug-while-doing-an-extrusion/6265/4 "2019-12-18T13:07:46Z")

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Pepe what you are explaining sounds like you want to project to a surface… I have just started playing with Shapr3D. In NX it is called projecting to a surface or a plane.

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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:** [December 18, 2019, 1:09pm UTC](https://discourse.shapr3d.com/t/i-think-i-found-a-bug-while-doing-an-extrusion/6265/5 "2019-12-18T13:09:55Z")

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Or you can simply go to the extrude tool in the Tools menu, and select the top face. A much more elegant solution is coming for this btw in 2020/Q1.