Homebrew PCBs

DJ Delorie wrote:
> I found out today that the Linux printing software (Gutenprint) now
> supports my R280 printer (the R280 came with a camera, I've mentioned
> this before).  So now I can control the dots more accurately.
> However, it seems that the printer just can't position a dot with,
> say, 1 mil of accuracy.  I haven't done much experimenting with the
> driver to try to reduce the variables that are causing this variation
> (like weaving method).  Note that this is with unidirectional
> printing; bidirectional makes it much worse.  The printer is 5760 x
> 2880 DPI, I've been using 2880x2880 for my tests.
> 

..

Inkjet transparency films vary widely between brands. the Epson film 
(now obsolete ) had a unique dye ink absorption coating that would 
always produce %100 solid fills. The ink did not sit on the surface 
unlike other brands I investigated at the time. You can buy an 
equivalent film from
here http://www.des-pl.com.au/products/products.asp?pd=PD00068
sorry, I don't know of any other suppliers.
You really have to test other brands of media.

As for dot placement fluctuations. Let us know when you've solved it as 
this is the major limitation of all inkjet printers.