Homebrew PCBs

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