Homebrew PCBs

Adam Seychell <a_seychell@...> writes:
> Thats what I have observed too. If you look at it under a microscope 
> then you can clearly see that line edges parallel to the print head 
> travel axis are much less jagged than line edges perpendicular to the 
> print head travel axis.

Actually, that's not what I see.  There seems to be a gaussian
distribution of off-bys in both directions (vertical and horizontal).
If I enable bi-directional printing, there's an obvious duality to
that direction, but I think it's either (1) the various print heads
aren't aligned to each other, or (2) individual dots don't leave the
print head at a true 90 degrees each time.

One of these days I'm going to write a program to print my image with
only one of the jets and see, assuming I can wait all day for it to
print ;-)

> I'm sure most printers do not print at the resolution manufactures 
> claim. I see pixelation errors when printing 6mil (0.2mm) lines from my 
> Canon MP810. This printer is rated at 1200dpi (7 pixels in one 8mill 
> line) yet I see some lines are significantly wider than others 
> indicating the printer  software is down converting the image to a lower 
> resolution.

On my laser printer (600dpi) I don't use 6 or 8 mil lines.  I use 6.67
or 8.33 mil lines, which are exact(ish) multiples of the print
resolution.  Otherwise, yeah, some lines are wider than others by a
pixel.