This thing will keep vertical boards (such as laser-cut printer feet) from sliding around on a surface. It's fully parametric, well commented, and very quick to print.
The STL and default values are suitable for holding the 6mm feet of a Printrbot LC in place using #4 wood screws with 82-degree countersink angles. There's an STL for #6 screws as well.
I use this as part of my parametric printer enclosure, which is available here: http://www.thingiverse.com/thing:39787
1) Edit the "User-defined values" values to meet your needs. Configure both the board and screw properties if necessary.
2) Print an anchor for each end to be anchored.
3) For perfect positioning, install with the board in place if possible.