Welcome to the SeeMeCNC Community

This is a derivative of a derivative on thingiverse. You will need OpenSCAD installed if you want to change any of the dimensions.

Essentially this mount has 4 mounting holes and a slot to slide in the circuit board. All aspects of the design are configurable, I even build one for the EasyDriver.

http://www.thingiverse.com/thing:10115

I've attached my OPENSCAD file modified for the Velleman board and the exported stl file to print.

Prints pretty good. I didn't have Slic3r set well enough to fill in the walls, but it will still function fine. No need for brute strength in this part.
Thanks for the file.
Printed on a Prusa, BTW.