Attached is a zip file containing a SCAD file with a model of a wall I'm attempting to add brick to the face of.  the imported STL file was constructed in FreeCAD and then I use OpenSCAD and the included tools to apply the brick to the appropriate faces of the wall in preparation for 3D printing. In this case, the height of the wall is not equal to an even multiple of brick courses, plus mortar lines, so I have a course of bricks projecting above to top of the wall.  I thought I could create a cube the length of the wall and difference it from the product of the brickpattern output and get what I want, but the difference produces no change. Am I doing something wrong with the difference operation, or am I expecting it to do something it just can't do? If the latter, I'll have to get back into brickpattern and modify it for this situation. Thanks Bill Lugg SDG