# Why are some areas not extrudable?

**URL:** <https://discourse.shapr3d.com/t/why-are-some-areas-not-extrudable/15265>\
**Category:** Modeling Questions\
**Created:** [October 10, 2021, 6:34am UTC](https://discourse.shapr3d.com/t/why-are-some-areas-not-extrudable/15265 "2021-10-10T06:34:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![swebal](https://avatars.discourse-cdn.com/v4/letter/s/bb73d2/32.png) [@swebal](https://discourse.shapr3d.com/u/swebal)\
**Post date:** [October 10, 2021, 6:34am UTC](https://discourse.shapr3d.com/t/why-are-some-areas-not-extrudable/15265/1 "2021-10-10T06:34:22Z")

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These are all circles, but only some areas are extrudable, why?

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/2/2b8d293648d51c344c3656e82001f600c774422e.jpeg)

I’m working on a geared design, but using imported dxf gear patterns are waaaaay to slow to work with due to all the control points, so I’m forced to use simple circle representations.

Idea: When locking a sketch, don’t search or display control points during selection. I think this would speed up the workflow to… usable. 🙂

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**Author:** ![swebal](https://avatars.discourse-cdn.com/v4/letter/s/bb73d2/32.png) [@swebal](https://discourse.shapr3d.com/u/swebal)\
**Post date:** [October 10, 2021, 11:02am UTC](https://discourse.shapr3d.com/t/why-are-some-areas-not-extrudable/15265/2 "2021-10-10T11:02:27Z")

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Closing and opening the file seems to resolve this issue.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/3/3baaebf4a2b98186086e6b33c0cf2a8dd1b0067e.jpeg)

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**Author:** ![TigerMike](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/tigermike/32/32650_2.png) [@TigerMike](https://discourse.shapr3d.com/u/TigerMike)\
**Post date:** [October 10, 2021, 11:31pm UTC](https://discourse.shapr3d.com/t/why-are-some-areas-not-extrudable/15265/3 "2021-10-10T23:31:26Z")

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Suggestion: you can download a variety of gears in STEP format from McMaster. They can be imported and used in Shapr3D. I use them all the time.

I assume your overlapped double circles represent the tooth height, yes? When I design a gear train I only need to use the pitch diameters to determine center to center distances. Once done I can establish the shaft pins and then use the Align tool to center the appropriate gear.

And yes, that’s an odd sketch anomaly where you had to restart the app.

> **[McMaster-Carr](https://www.mcmaster.com/spur-gears/component~gear/metal-gears-and-gear-racks-20-pressure-angle/)**
>
> McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.