# How stl. to alignment accurately?

**URL:** <https://discourse.slicer.org/t/how-stl-to-alignment-accurately/44294>\
**Category:** Support\
**Created:** [August 31, 2025, 7:35pm UTC](https://discourse.slicer.org/t/how-stl-to-alignment-accurately/44294 "2025-08-31T19:35:11Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![guozhuang](https://avatars.discourse-cdn.com/v4/letter/g/57b2e6/32.png) [@guozhuang](https://discourse.slicer.org/u/guozhuang)\
**Post date:** [August 31, 2025, 7:35pm UTC](https://discourse.slicer.org/t/how-stl-to-alignment-accurately/44294/1 "2025-08-31T19:35:11Z")

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I have two documents(stl.), I want to align them and try measure the location of implants, but I used FastModelAlign, it shows significant differences, I would like to know if there are any other registration methods available. Thanks for your help.