Just shown at 2012 CES, have a look at this new 3d printer... makes quite a good sized model unlike 3d machines in the past. Also, it uses ABS as opposed to some sort of poisonous plastic. Would be able to make nice enclosures for your DIY stuff ( eg. ardunio controller ), knobs, LED end cap, MAME overflow, nice U-tubes for your overflow, etc.
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http://www.makerbot.com/
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Only $1799 - $2000 USD for this machine! Announced at CES. Just wondering how much the material cost though for typical project at $48/kg… lots of colours.
I also believe you can download lotsa ready made models or manipulate them to your needs. Seems to work on Mac or PC too.
msjboy