Homemade router as rapid prototyping machine

Dear Sirs ,

I need to build extremelly precise router which will be used as stereolithography machine.

It will print only the outer edges and lines of a object and it will travel in 2D like free analog heads but not like commercial ink jet printer.

Router will carry a laser diode and this set will expose polymer layer by layer.

What kind of steppper motor I need , or how will I understand which is suitable.

Where can I buy from ?

Speed is not a matter but the extreme precise working.

And I need to transform sla files as input to my machine.

How will I do this ?

My machine will print 50 centimeter wide pieces least from epoxy or acrylate.

Please advise ,

Umut



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