guja wrote:
>
>
> you dont need spray etcher to make such boards.
> it is much easier to make tank that uses foam .
> you need tank (with angled board inside) , low pressure pump, simple
> bubbler and few litres of fecl .. and an (domestic) additive to make
> good fecl bubbles :)
>
Spray etching has the advantage of etching more downward and less
sideways. There is no other way of achieving that with non-spray etch.
Gravity can't help you either because insoluble film formed by FeCl3 or
CuCl2 etching at the copper surface does not fall uniformly or
predictably in a stagnate solution.
Still, I do not think its worth while a hobbyist building a spray etcher
in order to improve etch factor.
Adam