Homebrew PCBs

I had this idea about seven years ago. But at that time the Laser Diodes
of 405nm were impossible to obtain (USD$4000).  Since last year, I have
taken this idea again, because now one can buy those laser diodes around
USD$40 (85mW) in eBay. I saw in web (youtube) some germans guys
experimenting with this, but I have not see the results. Also I read
about a french engineer who made some experiments with UV LEDs coupled
with a fibre optic. I have a Polish paper which expose the use of this
idea to get 50um (2 mils) clear cut beatiful traces, but they use very
expensive optics ( telecentric lenses, glavos and others things which
are too costly for the DIYer ).

Now I struggling with optics.  When I get some control of the LASER beam
waist, I gonna put my laser module in a CNC engraver.

There are anyone working on that in this group?