Blender grid setup for 3D printing

I've been doing a lot of 3D printing lately and thought it would be helpful to share how I set Blender up.
This video specifically talks about the grid and getting it to show you real world metric values.

[@KommaAchtKommaEins]

So simple and yet my grid was completely wrong all the time. Thanks. Finally everything makes sense. :)

[@soluadesign]

Thanks a lot. excellent tutorial. Just what I needed.

[@kenmasters2231]

thks for being concise and to the point .

[@weeheavy6672]

Very helpful!

[@GeoZero]

This was most excellent.

[@newz2u158]

I have a CR10 Mini with build area 300x220x300mm..what would I set my lines at?

[@davetorrey8303]

do you have an updated version for blender 3