Nice job.
I built a splash etcher years ago and found the trick is to get some randomness to the splash. I did this by making the radial edge of the splashier paddle very irregular.
I am wondering if some external surface features on your tubes may make a finer spray pattern. I got this idea from cleaning paint rollers with the garden hose. With the water hose stream you can spin up the rollers really fast but the interesting thing is the fine spray of water that departs the spinning roller. All the little hairs of the roller nap act like little emitters. I saw a likely roller cover at the home center a few weeks ago, the tube was PVC but not sure about the nap. It would have to be tested to see its resistance to the chemistry.
Craig
--- 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.
>