Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Adam Seychell <a_seychell@...> 
wrote:
>
> 
> With currently technology, the limitation is in the inkjet printer, 
and 
> how precisely it can place  drops of ink. The DPI claims are 
absolutely 
> meaningless for PCB artwork if the drops can wonder off a few 
thousands 
> of an inch. Look at your transparency prints under a microscope and 
you 
> will see what I mean. There are no market expectations to encourage 
> inkjet manufactures to build printers with more precisely placed 
drops. 
> This is a shame because the potential is there.
> 
> 
> Adam
> 
> > > 
> > 

First off I apologize if I am taking the above too far out of 
context. It is not my intention to take the statements out of 
context, only to point out that the DPI limitations are NOT STRICTLY 
RELATED TO THE PRINTER ALONE. I have done many experiments with 
transparency materials for use with photo-etching and can say that in 
MY experiences the various TRANPARENCY MATERIALS fluctuate greatly 
between brands and batches of the same brand. I  find this 
fluctuation in both the ability of the material to quickly absorb ink 
and the Coarseness ( unevenness or GRAIN ) of the side intended to 
receive the ink. Stop and consider what the intended purpose of MOST 
of these materials ultimately is, OVERHEAD PROJECTION at very high 
magnification, not a lot of requirement for high resolution.

Using an OLD Epson STYLUS 1160 (supposed resolution of up to 720 x 
1440 and standard Epson ink) The best material I have found is that 
which is INTENDED for the creation of  "contact negatives" for 
silkscreen printing.

I have posted this here before I believe, but as the subject comes up 
now I'll post again, 
< http://screenprinters.net/product_group.php?gid=inkjetfilm >
At one time you could request a free SAMPLE pack of the material. I 
don't know if that offer still stands but you could search the site 
for the offer or send an email requesting a sample and you might get 
it.