# Dimensions exported stl file

**URL:** <https://discourse.slicer.org/t/dimensions-exported-stl-file/34956>\
**Category:** Support\
**Created:** [March 18, 2024, 2:05pm UTC](https://discourse.slicer.org/t/dimensions-exported-stl-file/34956 "2024-03-18T14:05:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Marthe](https://avatars.discourse-cdn.com/v4/letter/m/ba8739/32.png) [@Marthe](https://discourse.slicer.org/u/Marthe)\
**Post date:** [March 18, 2024, 2:05pm UTC](https://discourse.slicer.org/t/dimensions-exported-stl-file/34956/1 "2024-03-18T14:05:53Z")

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Dear all

After segmenting a body part from a CT in 3D slicer and performing a ROI cut, I exported the segmented part as an STL to make a mold in Solid Edge. However, when I open the STL file in Solid Edge, the dimensions seem to be changed (much larger). Does anyone has an idea what went wrong? I already checked if the units used in 3D slicer and Solid Edge are the same in the settings.

Thank you in advance!

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [March 18, 2024, 2:09pm UTC](https://discourse.slicer.org/t/dimensions-exported-stl-file/34956/2 "2024-03-18T14:09:02Z")

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STL files don’t store units, so you need to do it manually. By default Slicer will output mm, while many other systems might use meters.