You may need to adjust the size parameters in the provided SCAD file to get a snug fit. The default values are the ones that worked well for me and my setup. I have also included breadboard mount mk1, a much more simple version of the design that only consist of a rectangle and the full wall perimeter for holding the breadboard. There is also a cutout in the center to save material. READ: If you have issues slicing make sure your using the latest "stable" version. I had problems with perimeters when slicing with the "experimental" version Watch it print on Youtube: LINK SOON Blog post: http://twiebs.net/blog/?p=6If you have issues slicing make sure your using the latest "stable" version. I had problems with perimeters when slicing with the "experimental" version