Re: Re: Plotters for application of Etch resist

I agree!

A trick that can be very useful is to use a laser printer to print on mylar or other transparent material. Although it is
difficult to get sufficient high contrast since the toner does not stick well to the mylar. The trick is to apply a very thin
metallic coating that sticks to the toner when it is laminated with heat. One brand name is "Omnichrome". The metallic
material is sold in stationary stores and used to make gold or other metallic color letter heads and similar applications.

Bertho Boman
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Jon Elson wrote:

> Yeesh, what a way to drive yourself nuts! It just isn't worth the hassle!
> I use photographic techniques to do this. The direct ink on copper is
> VERY tough to get right, and the ink is always drying up in the pen.
> For small 2-sided boards, and for larger 1-side ones, you can use a
> laser printer output, and either contact print the paper output onto high-
> contrast film, or make the laser print directly onto transparency film, and
> then contact print that onto th dry-film resist made by DuPont, under the
> Riston label. You can get the boards pre-sensitized with this stuff, or
> you can laminate the resist yourself. The limitation with laser printers is
> that the registration of 2-sided artwork will not be good enough for
> most components with boards much larger that 3" square.
>
> I made my own laser raster photoplotter for this purpose, but I wouldn't
> suggest anyone else do this unless you are planning to make a lot of boards.
>
> Jon