I designed and built a number of different MAME Arcade systems during 2004/5 - started a new design in 2008 and have not got it all finished (yet) - still working on it !
Multi-colour 3D printing
I have done work on Mixing and colour 3D Printing, always interested in more development in this area, if you want to collaborate, let me know.
3D printer - 3DR
I have designed, made and built lots of RepRap 3D printers. 3DR is all my own design and it's all open source.