Align object to the world plane


I would like to align my object to the worldplane so I can mill it on the cnc? Now it is somewhere in the aire, totaly not aligned.
How do I do this?
Boom_I.stp (64.7 KB)

I have not looked at your file.

Usually this is done with the Orient3Pt command. Select three points on the bottom side of your object and then three points on the XY plane.

Rhinoceros Help - Orient3Pt | Rhino 3-D modeling (