We bought a RepRap (Shapercube) a while ago and some time later came up with a potential business model: Print prototype prints for designers who are designing 3D models but don't have a printer to print them on yet. As we'd rather write code than do anything by hand, we're writing a website and a series of tools to automate the whole process. Some of it will hopefully get released into the Open Source world at some point.
This is made using ShinyCMS, DBIx::Class (and many other Perl modules), MySQL and Perl.