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Subject: Re: [Homebrew_PCBs] help request: disappointing etch resist development

From: James <bitsyboffin@...>
Date: 2014-08-29

I put your images on imgur, that sendspace tried to download some exe to me the first time, dodgy as..

  http://imgur.com/0kyPB0W
  http://imgur.com/2L4v3Gg

what weight of tracing paper are you using?  It looks almost like it's crinkling or non-uniformity in the paper coming through.  The heaver weight, the more "stable", I use 110gsm (but I also use Dry Film resist, not pre-coated boards).

Also how are you clamping the artwork to the board, and what sort of light-source are you using.





On Fri, Aug 29, 2014 at 11:53 PM, Leon Heller leon355@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
 

On 29/08/2014 12:49, mattmoose1969@... [Homebrew_PCBs] wrote:
> Hi Leon,
>
> I'm laser printing the artwork onto 90gsm tracing paper, as recommended
> by someone who has done a lot more of this than I have.

It might not have enough contrast, try using LaserStar film. I think
it's available from RS, or you can get it from Mega Electronics (UK).


Leon
--
Leon Heller
G1HSM