# STL files overlapping

**URL:** <https://discourse.slicer.org/t/stl-files-overlapping/41653>\
**Category:** Support\
**Created:** [February 12, 2025, 5:04pm UTC](https://discourse.slicer.org/t/stl-files-overlapping/41653 "2025-02-12T17:04:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Swarna\_Yerebairapura](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/swarna_yerebairapura/32/78311_2.png) [@Swarna\_Yerebairapura](https://discourse.slicer.org/u/Swarna_Yerebairapura)\
**Post date:** [February 12, 2025, 5:04pm UTC](https://discourse.slicer.org/t/stl-files-overlapping/41653/1 "2025-02-12T17:04:42Z")

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Hi,  
I am unable to overlap two STL files of mandibular canal despite of using Transform module. Is there any alternative feature?

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/1/f1c4603accd9121b4838b813dd7cb36bb8328c0d.png)  
Please advise.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [February 13, 2025, 4:10am UTC](https://discourse.slicer.org/t/stl-files-overlapping/41653/2 "2025-02-13T04:10:24Z")

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You can use a recent version of Slicer that allows you to adjust the center of rotation in 3D. That should make the alignment much easier.

> [@New feature: Interactive transformation + adjustable center of rotation](https://discourse.slicer.org/t/new-feature-interactive-transformation-adjustable-center-of-rotation/36974):
>
> Any nodes can now be translated, rotated, or scaled by interactive handles. Editing operations can be constrained to specific axes and center of rotation can be freely chosen. The handles are available both in slice and 3D views. Transform nodes can be easily added and visualized for any node in 3D Slicer by right-clicking on the node in the Subject hierarchy visibility column and checking “Interaction”. [[Transform Interaction Handles in 3D Slicer] ](https://www.youtube.com/watch?v=ielxgJS-6SI)Visualization options Visualiza…

Alternatively, you can use landmark registration or various model registration methods. See details on the [registration](https://slicer.readthedocs.io/en/latest/user_guide/registration.html) page.