> >
>
> Yea!! It worked. I used my laser printer at work with standard OH
> transparency sheets. It came out very dark and contrasty. This time
> exposed for 4:30s from 12" (small light source). It took some time for the
> developer to remove the exposed resist (positive board), but it etched very
> nicely in CuCl2 and H2O2. I also had a H2O2 bath to periodically remove
> insoluble CuCl from the board while I was etching. I would like to get a
> bubble tank so I don't have to do that, but it worked very well.
>
> I am now ready to drill my board for my movie sound project. ;o)
>
> Thanks,
> Chris Maness
> KQ6UP
>
>
You don't even need transparencies. I've used ordinary laser printer paper, a friend of mine has better results using tracing paper and laser printing on that. You have to make sure you print it so the toner side is against the board when you expose, and weight a piece of glass over it to hold the pattern completely flat against the board. Once you figure out the correct exposure time it can produce very consistent results.
Bubble tank is easy, I built one out of acrylic but I've seen people use those narrow rectangular food storage containers with an aquarium air pump and heater. The heat is the most important part.