Homebrew PCBs

On 16/02/2012 14:19, storan4wd wrote:
> I usually make PCBs with Riston dry film and artwork from an Epson D92
> inkjet.
>
> Unfortunately, the inkjet can't cope with 0.5mm LQFP (edges are too
> ragged especially on diagonals + there's too much sputtering at high
> resolution 2400dpi or more and it won't print with black ink only at
> high resolution so opacity is not satisfactory).
>
> So I bought a Samsung Monochrome Laser ML-1860. (\ufffd40 from Dixons UK) It
> puts the inkjet in the shade - its 1200x1200dpi resolution easily
> produces the artwork I need; on transparency OHP film LQFP pads match up
> perfectly, large areas are opaque and 10mil track is unbroken. (For
> toner transfer people, a quick test with magazine paper came out very
> well - err.. make that jaw-droppingly well!)
>
> The only downside is the transparency film; both types of laser OHP film
> I've tried (Clarkes Stationers "el cheapo own brand" and Black Diamond
> 100micron Laser/Copier OHP Film) both buckle more than I would have
> expected making contact exposure unhappy.
>
> I did try printing on paper and using oil to make it translucent but the
> exposure times are too long compared with film + it buckles slightly also.
>
> Anyone in the UK got a suggestion for a really stable Laser OHP film please?

Try Mega Electronics LaserStar film, I used to use it with an HP laser 
printer. I now use their JetStar Premium film with a cheap 1200 dpi HP 
9540 inkjet printer.

Leon
-- 
Leon Heller
G1HSM