# Modify .stl file

**URL:** <https://discourse.slicer.org/t/modify-stl-file/17455>\
**Category:** Support\
**Created:** [May 4, 2021, 7:52pm UTC](https://discourse.slicer.org/t/modify-stl-file/17455 "2021-05-04T19:52:38Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Hamid](https://avatars.discourse-cdn.com/v4/letter/h/5fc32e/32.png) [@Hamid](https://discourse.slicer.org/u/Hamid)\
**Post date:** [May 4, 2021, 7:52pm UTC](https://discourse.slicer.org/t/modify-stl-file/17455/1 "2021-05-04T19:52:38Z")

</div>

I am working with Slicer 4.11 and 4.13. I have a stl file and want to do some modification like cut a part and add another part to it. When I open the stl file from File tab as a data, all SegmentEditor tabs are inactive. Is it possible to modify stl file? If so how?  
Many thanks in advance!

---

<div class="post-metadata">

**Author:** ![Hamid](https://avatars.discourse-cdn.com/v4/letter/h/5fc32e/32.png) [@Hamid](https://discourse.slicer.org/u/Hamid)\
**Post date:** [May 4, 2021, 9:07pm UTC](https://discourse.slicer.org/t/modify-stl-file/17455/2 "2021-05-04T21:07:38Z")

</div>

My stl file is Aorta with cannula connected.