# Micrometric structures

**URL:** <https://prepomax.discourse.group/t/micrometric-structures/2879>\
**Category:** General Questions\
**Created:** [July 23, 2025, 2:04pm UTC](https://prepomax.discourse.group/t/micrometric-structures/2879 "2025-07-23T14:04:25Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![matheusdiassousa](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@matheusdiassousa](https://prepomax.discourse.group/u/matheusdiassousa)\
**Post date:** [July 23, 2025, 2:04pm UTC](https://prepomax.discourse.group/t/micrometric-structures/2879/1 "2025-07-23T14:04:25Z")

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Hello everyone, does anyone know if the software supports micrometric structures?

I am importing a STEP file (solid) from FreeCAD, and it comes in meters instead of micrometers. I’m using the scale function to resize the solid and match the dimensions I want to simulate. However, when the software doesn’t automatically close, it ends up getting distorted.

Does anyone know what to do?

Thank you in advance.

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**Author:** ![belov](https://avatars.discourse-cdn.com/v4/letter/b/bc8723/32.png) [@belov](https://prepomax.discourse.group/u/belov)\
**Post date:** [July 23, 2025, 2:53pm UTC](https://prepomax.discourse.group/t/micrometric-structures/2879/2 "2025-07-23T14:53:35Z")

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Change the unit prefix **.MILLI.** in the STEP file - **SI\_UNIT(.MILLI.,.METRE.)**  
Use **.MICRO.** or another

- .UNIT. **1000**
- .DECI. **100**
- .CENTI. **10**
- .MILLI. **1** - FreeCAD
- .MICRO. **1e-3**
- .NANO. **1e-6**

Example

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/2/2afdeb3fb0401c4835ca909282ae725366329f9b.png)

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [July 23, 2025, 3:53pm UTC](https://prepomax.discourse.group/t/micrometric-structures/2879/3 "2025-07-23T15:53:24Z")

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When preparing geometries for PrePoMax simulations with meters in FreeCAD, I use the [Part Scale](https://wiki.freecad.org/Part_Scale) tool but there are a few other tools for that as well. Just select Unitless system in PrePoMax and ensure consistent units for analysis definition or use the SI(mm) system. With Query —\> Distance or ruler at the bottom of the viewport, you can measure the model and check if its size is correct. This is very important to avoid mistakes.

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**Author:** ![matheusdiassousa](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@matheusdiassousa](https://prepomax.discourse.group/u/matheusdiassousa)\
**Post date:** [July 23, 2025, 7:29pm UTC](https://prepomax.discourse.group/t/micrometric-structures/2879/4 "2025-07-23T19:29:04Z")

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What is this “making sure you are not a bot!”??

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [July 23, 2025, 7:32pm UTC](https://prepomax.discourse.group/t/micrometric-structures/2879/5 "2025-07-23T19:32:27Z")

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> [@matheusdiassousa](#):
>
> What is this “making sure you are not a bot!”??

Newly implemented Akismet anti-spam system on the FreeCAD wiki (due to frequent spam attacks). Apparently, it displays that as a preview for links to the wiki. I will try to replace it.

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**Author:** ![matheusdiassousa](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@matheusdiassousa](https://prepomax.discourse.group/u/matheusdiassousa)\
**Post date:** [July 24, 2025, 9:00am UTC](https://prepomax.discourse.group/t/micrometric-structures/2879/6 "2025-07-24T09:00:13Z")

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Thank you for your support, changing the text units did not worked for me.  
I changed the text from E-02 to E-05 and created the project using mm units.  
Your suggestion of opening the .step in a text editor helped a lot. Thank you very much.

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**Author:** ![matheusdiassousa](https://avatars.discourse-cdn.com/v4/letter/m/41988e/32.png) [@matheusdiassousa](https://prepomax.discourse.group/u/matheusdiassousa)\
**Post date:** [July 24, 2025, 9:01am UTC](https://prepomax.discourse.group/t/micrometric-structures/2879/7 "2025-07-24T09:01:04Z")

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Thanks for your support.