Homebrew PCBs

Hi guys,

I am working on another idea - still pretty rough at the moment.  If 
things are the same as they were years back, all HP laser printers 
using their PCL language.  I used to have some documentation on that 
but have since lost it many years ago.  I am wondering if anyone has 
a link to any such documentation?

What I am working on is a way to take the PCL output for a printed 
PCB and use that information to control "something" to apply a 
resist to the PCB material.  In other words, print to a file using a 
laser printer driver. Then I would use that information to control 
the "Something" that would apply the resist of some sort.

It's a bit of a hair brained idea at the moment, but might be worth 
looking into further.

Thanks
Chris