Align origin and axis to custom vertices Let's say you have some vertices which are places randomly in space.
You want the origins to be aligned based on these vertices. I struggled a lot with it previously
so I want to share the easy method I found.
Here is a solution:

In Edit mode select right vertices.

Go to Transform Orientation - Plus icon to create new orientation based on your selection




Back to Object Mode check ‘Origins’ box



In Object Mode use ‘Align to Transform Orientation’ operation



Enjoy!


I hope it was useful! Happy holidays everyone!