Before I create a Smoothie config page for the documentation,

+Peter van der Walt, what way do you wish to have documented?

OK, I will do the C3D the way @raykholo recommends to his customers, as well as the 3 variants @Richard_Betel outlined. For the GRBL setup is there only one way to connect, or are there multiple variants as well?

@funinthefalls Did you see that I have already documented most of the GRBL setup?
I think it’s better to link to the grbl wiki for hardware setup, as I did.
(see http://cncpro.co/index.php/31-documentation/initial-configuration/firmware/grbl-1-1e)