Re: 3D printer, first 2D prints

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "dandumit" <dandumit@...> wrote:

> The issue of image dimensions is probably related to delays from
> original stepper - encoder - new stepper.

The processor is running at 80Mhz so there is really no real delay at
the pulse rates we are talking about. I'm not actually having an
issue with image dimension especially apart from perhaps the
compression of the roller and the stretch in then cable tensioning spring.

> I'm trying to modify an epson d68. Is making a lot of curious
> movements before print. I didn't figure out how to detect when it
> really start to print...

The first step is to really study the printer, I skipped this too
much, luckily this printer is dumb enough that it doesn't really
matter too much.

You need to figure out what the printer does when it feeds the paper
from that you can work out how to sync, the epson definately rotates
the roller in reverse with the print head in a certain position to
pick up the paper, you might need a microswitch to detect the print
head position is there.

> I was even thinking to rebuild the printer from scratch and I have
> found a printhead hack:

Me too, driving a print head is not too much of a problem but its the
PC to processor interface that may be a sticking point if you want
fast printing and especially if you ever want colour.

Graham