# Measurement error?

**URL:** <https://discourse.shapr3d.com/t/measurement-error/40072>\
**Category:** Modeling Questions\
**Created:** [December 31, 2025, 9:17am UTC](https://discourse.shapr3d.com/t/measurement-error/40072 "2025-12-31T09:17:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Tankurttan](https://avatars.discourse-cdn.com/v4/letter/t/ac8455/32.png) [@Tankurttan](https://discourse.shapr3d.com/u/Tankurttan)\
**Post date:** [December 31, 2025, 9:17am UTC](https://discourse.shapr3d.com/t/measurement-error/40072/1 "2025-12-31T09:17:28Z")

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```auto
The total length is 40 mm, why doesn't it divide by 20-20, why 19.9906 and 20.0094?

```

 ![40mm](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/8/d/8d8db3af1f605ad74d110d90afd994703ec20bcf.png)

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<div class="post-metadata">

**Author:** ![Xdrakosha](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/xdrakosha/32/24881_2.png) [@Xdrakosha](https://discourse.shapr3d.com/u/Xdrakosha)\
**Post date:** [December 31, 2025, 9:58am UTC](https://discourse.shapr3d.com/t/measurement-error/40072/2 "2025-12-31T09:58:51Z")

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Usually, that’s because of some kind of unevenness. If you could share your project, I could probably explain why this is happening. One screenshot isn’t sufficient.