Remix of ReprapPro z-motor mount

I changed the z-rail clamp to a design with two grub screws. My original reprappro mendel is showing signs of age: the different clamps start to break apart, so I wanted another design without the bending clamps.

I have created a new x-joint, which replaces the C-clamps on the bottom frame.

PS: Structural parts on the Mendel uses 8mm smooth and M8 threaded rods.

**Updated: Print instructions**
Tapping requires a thick wall (lots of perimeters).