Well, there it is! This evening I designed this small sprocket wheel in Autodesk 123D Design, a free and very basic solid modelling application, available here.
Why did I choose to make this for my first foray into the future of manufacturing? Well, it's small, simple and if it works could become a little cog (quite literally) in my ongoing DIY film scanning endeavour. That's if it comes back and engages the film properly. I've referenced the SMPTE super 8 dimensions, so I've got to hope it will. I'm keen to see if this method of design/manufacture will enable me to make the small pieces for this project with anything like the required precision.
I've sent this off to Shapeways.com who knows what I'll get back in 10 days time, stay posted...