Dear Andrew,
I have tried some positions on the transparencies.
Seems that the edges are the most inaccurate. The centre portion of the sheet is the most accurate. But still some misalignment. But it seems a bit constant now. I get the idea that the warping is also dependent on the amount of toner in the area.
I use a large hole PCB with lots of holes in it and the inaccuracy is a bit less then with just the 1cm hole grid.
I have done some other tests, like printing out an empty sheet and then printing on it. And comparing it, maybe the warping is due to the plastic shrinking due to the heat. But this is not the case, they are identical.
Another test I tried is comparing it with ordinary paper. The alignment is much better but i can only verify this while looking trough the holes. Need to do some further tests and buy some special paper a lot of people use instead of transparencies (do not know the name in english).
Thank you for the suggestions.
--- In Homebrew_PCBs@yahoogroups.com, Andrew Villeneuve <andrewmv@...> wrote:
>
> Does the widening only happen near the side of the paper that feeds in?
>
> I'd be curious if you got better results by moving the pattern to the bottom
> edge of the page, so the paper has plenty of time to be fully engaged in the
> transfer roller before your pattern is printed.
>
> -Andrew
>
> On Mon, Jun 21, 2010 at 12:16 PM, Slavko Kocjancic <eslavko@...>wrote:
>
> > I have same problem.
> > Laserjet 1020 printer. The output in X is ok but on Y axis is terrible.
> > Near all time is shorter by aprox 0.5% but two same prints doesn't gave
> > same output. Ie if I print two transparencyes they does not fit exactly.
> > I think the paper feed is not good. When printer grab paper they 'wigle'
> > left and right little.
> >
>
>
> [Non-text portions of this message have been removed]
>