Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

"over here" is germany...sry. There are some commercial suppliers for acid resistant pumps but they are not cheap, quite the opposite.

By spray I mean finely atomized with nozzles, the "etchinator" does make some "spray" of sorts but the droplets are much larger than the spray with nozzles and pump. Both methods work, but all the professional Etching is done with the spray nozzle type.
I have heard some good and some bad from the rotary tube type, there is not overly much to find in terms of user feedback but one of the problems reported was banding in some areas while etching and that the lower parts are always slightly overetched due to the etchant running off downwards when the plates are vertical.

This would also be a concern with the nozzle type, some means of constantly moving either nozzles or the workpiece would be needed to etch a larger plate (A5-a4 size) in an even way.

So far a etching machine of either type is still in the back of my head but I was not willing to go thruh the trouble of building one.

I would rather try and make the electroetch work since it seems to produce less undercut than traditional method is cheaper in the long run and it would be much easier to use a setup with two electrodes(Kathode) and the workpiece(anode) in the middle to make some double sided etching.
I am not sucessful because my toner does not hold up in copper sulfate electolyte, it gets gradually eaten away before the etch is finished. If I can find a toner that will work its by far the easier method.