How to measure a vehicle with a high accuracy with mm?

[absoltue_beginner]

@MarkT

Well if you'd explained that.... Simple, linear encoder strip/scale (optical or magnetic are available).

Good search terms: "motion control", "DRO", "linear scales"

sounds good ! okay, now I am revealing, what I am planning to do:

i wanna built a 3D Printer for building a house. Yes, you heard it right, a 3D Printer for building a house Now everyone here goes "booooooom"

I have a investor, so therefore, there is no problem with money.