So, you've created a sweet rubber stamp to stamp Mitch Altman's awesome hackerspace passports with. Now what? Are you just going to take that thing and hot-glue it to a block of wood? Well, if you're anything like us, probably. But allow me to suggest an alternative-- print out a custom-sized rubber stamp handle, and issue visas in bureaucratic style!
Edit the stamp_handle.scad file and set the appropriate parameters as described in the file. Run it through openscad, import the STL file and print to taste! You may want to put some fresh blue tape on your platform to help the plate stay extra flat, although it turns out that a little curling is actually OK on a stamp backing. Use some double-sided tape to affix the stamp to the handle, and away you go!