> Are there any good tutorials on plastic mould? It seems to be very
> important but quite a difficult topics. The mould is always not cheap to
> make and hard to modify, not like electronics circuits. ;-(

This is the sort of area where you just have to interact with someone that
is very experienced with mould making, and knows the ins and outs of
injection moulding. You have to get them involved at an early stage, saying
how big you need the box, what the constraints are, and so on, and have them
give input during the drawing stage.

Then you get your one-off prototype done by one of a number of ways. The
"well known" one is "stereo lithography" - you can find all you want to know
about this through google. To do this will generally involve sending
electronic copies of your drawings to a company that does it, and in due
course back come your examples, which should be good enough for doing fit
checks, and so on.

If you want to keep this part in house, then look at a "Z Printer" (as
featured in CSI NY) from http://www.zcorp.com/ or a Versalaser from
http://versalaser.com/ which both produce examples from electronic drawings
AIUI. I do not have any experience with any of these, but have seen examples
of Stereo Lithography and Z Printer outputs.

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