Congratulations, and very good work you did on this project.
However, I still think that the most simple spray etching system is like the Kepro tanks.
I did used those machines in the 80s; now I am trying to replicate and refurbishing a broke tank and manifolds, but I remember that you could do hundreds and hundreds of PCBs without any "shading" or "banding" effects on the copper.
For those interested in those systems, this place has very useful photographs:
http://www.cnczone.com/forums/273303-post306.htmlRegards.
--- In Homebrew_PCBs@yahoogroups.com, "cunningfellow" <andrewm1973@...> wrote:
>
> Only took five years
>
> http://www.instructables.com/id/The-Etchinator-low-cost-spray-etcher/
>
> Please give any feed back.
>
> I am working on the laser plotter write up now.
>