How many times have you needed a box for your new electronic gadget or what you need a box to. In the scad file just enter size of box as variables, wall thickness and you will get a box. You can add holes and punch them with Openscad or if you like to do them in some othe way. Feel free source code enclosed. Just uncomment in the end if you like to print the box or the lid. And export them as stl-files No idea printing both at the same time ;-) /Ice