multi purpose rail stand

https://www.youtube.com/watch?v=LzUJghx9X_w&feature=youtu.be

I have made this design to have a quick mounting base for rail on 3D printers and to be able to put any stand on this base

I have made 2 kinds of base
One to insert in rail 20x20
one to screw on rail

with this design, I have put :
one stand for go-pro type
and one stand for ps3eye type,
but it's easy to add any stand like tools support with an hexa rode

I have made an extension to have the good height but it's simple to design any height you need

I have made a T_nut with m4 thread which permit to use the simple base on any place on the rail just by screwing the nut