# Parts Disappearing from Design

**URL:** <https://discourse.shapr3d.com/t/parts-disappearing-from-design/35793>\
**Category:** Modeling Questions\
**Created:** [December 30, 2024, 12:31am UTC](https://discourse.shapr3d.com/t/parts-disappearing-from-design/35793 "2024-12-30T00:31:46Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Matt\_R](https://avatars.discourse-cdn.com/v4/letter/m/ed655f/32.png) [@Matt\_R](https://discourse.shapr3d.com/u/Matt_R)\
**Post date:** [December 30, 2024, 12:31am UTC](https://discourse.shapr3d.com/t/parts-disappearing-from-design/35793/1 "2024-12-30T00:31:46Z")

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So when I export this file - which, for some reason, is 1.33GB - as an STL so I can print it, the freaking wheels disappear!

I don’t know if it matters but most of this is not unioned. This was deliberate so I can keep the components free to make sure they will align to an existing part after printing.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/3/f/3f91fa884a995be830a5082e82f49718c377bc6b.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/d/9/d95be82a48be166244d7a2a2f02a5f64b41bc713.png)

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**Author:** ![SCALEMODEL](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@SCALEMODEL](https://discourse.shapr3d.com/u/SCALEMODEL)\
**Post date:** [December 30, 2024, 1:26am UTC](https://discourse.shapr3d.com/t/parts-disappearing-from-design/35793/2 "2024-12-30T01:26:39Z")

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I assume you imported the model and deleted parts you don’t want for 3d print.

Usually happens when your model is not solid or normals needs to be flipped.

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<div class="post-metadata">

**Author:** ![Matt\_R](https://avatars.discourse-cdn.com/v4/letter/m/ed655f/32.png) [@Matt\_R](https://discourse.shapr3d.com/u/Matt_R)\
**Post date:** [December 30, 2024, 3:17am UTC](https://discourse.shapr3d.com/t/parts-disappearing-from-design/35793/3 "2024-12-30T03:17:07Z")

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Why would you assume that? I didn’t deliberately delete anything.

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<div class="post-metadata">

**Author:** ![SCALEMODEL](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@SCALEMODEL](https://discourse.shapr3d.com/u/SCALEMODEL)\
**Post date:** [December 30, 2024, 3:43am UTC](https://discourse.shapr3d.com/t/parts-disappearing-from-design/35793/4 "2024-12-30T03:43:03Z")

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Imported models sometimes are not solid or normals need to be flipped?