Align scanned object with 3d model

I have a rough scanned inject in Rhino that I am using to create a 3d printed object. The original scan was rough so I basically used it to get the proportions correct. I would like to overlay or align the objects on each other to check general size and angles, etc. what is the best way to align the objects together to look for differences? I’m using Rhino 8.

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really hard to say without a file or at least a screenshot.

basically you need to find some features that are ease to catch / reference.

If the scan has planar regions I use
_PlaneThroughPt
a lot.

Also Cylinder, Sphere, Circle offer a fit through points option.
There is also
_pointCloudContour
_pointCloudSection
or a simple
_project
a line to the mesh…

and of course all transformations

please try above and if still no success: post the result, more infos / file / screenshot

kind regards -tom

Orient3Pt might be of some help if you can find the right set of features. —-Mark