I decided I wasn't happy with my PnP Blue circuit boards (no surprise, given my personality), but I didn't want to pay for the MG Chemicals UV light - so I made my own! It cost about $20 in LEDs from China, and all the wood used is scrap from around the shop. The glass was maybe $3. So, I believe that I saved money - as long as you don't count my time! If you count the time I spent, this thing cost me about $1000!
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click pics for bigger versions}

It works REALLY well. Even with my first couple, where I didn't really know what I was doing, they've come out at least as good as the best I could do with the PnP Blue toner transfer method. Its also MUCH faster! I'm liking this system a lot.

The business end.
It uses 200 UV LEDs, in 40 strings of 5. The 18V power supply came from someone's lap top (I've no idea whose), and at 2.23A is WAY more than I need. The LEDs draw about 20mA each, and the 40 resistors are drawing less than 19mA each, so the total rig draws about 800mA. I briefly thought about just using power direct from the wall, and using the LEDs as the rectifier with maybe a couple caps to reduce the ripple, but I decided that wouldn't be the safest option in the world!

200 LEDs and 40 27ohm resistors, joined with a couple different Western Union Linesman splices. Why? Because sometimes I get to be a bit obsessive.
Can you say, WAY more work than it was worth? I thought you could.
Wiring the LEDs took me about a month (though I took a couple weeks off in the middle, though), and the case for it took me about 15-20 minutes (not counting buying the glass; that was another 10 minutes - I really like having a great hardware store half a block from my shop!
It takes about two minutes to expose the board, about 30-45 seconds to develop it - maybe a minute - and you are ready to go. Totally cool! Mind you, if I were to do it again, I would use PnP to make 4 or so circuit boards for the LEDs, instead of making all those linesman splices! I'm pretty sure it will work forever, though, so I'm not overly bothered by it - now that its done!
By the way, I designed the LED array using
THIS SITE.
Gabriel