Homebrew PCBs

On 08/01/2012 15:20, Rich Osman wrote:
> Aside from obvious concerns like dimensional stability for really high
> resolution work, why not use a fresh print on the lightest weight paper
> your printer will feed?
>
> Sure, the paper will act as a UV attenuator but it's not going to block
> a lot of it. It should let you get a sufficiently uniform exposure for
> most work, particularly if you dither the UV source position a bit to
> compensate for the slight density variations in the exposed media. Most
> resist is a high contrast media, so slight density variations probably
> won't matter.
>
> I expect dimensional stability won't be as big an issue if the tool is
> used soon after printer.


There is an old technique that I tried once, which involved making the 
paper translucent with vegetable oil after printing. It worked fairly 
well with wide tracks, but was a bit messy.

Leon
-- 
Leon Heller
G1HSM