Homebrew PCBs

http://www.crystalaser.com/  has QUV 355-25 Crystal Laser of 25mW at 349 or 
351 or 355nm, just inside the photoresist window.
I don't know how much it is, for the moment, but the head is not so bulky. 
One can mount it on a CNC Machine easily.
Of course, some simple optics is necessary, because the beam is 0.9mm diameter.

Calculations:
Photoresist needs maximum 100mJ/cmp, that means 4 seconds/cmp with 25mW laser.
That means 240 seconds for 100x60mm. Four minutes of XY Plotter work.
If my calculations are correct, that is not too much.
Cristian

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