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Subject: Re: [Homebrew_PCBs] CNC drill holes and laser printer output

From: Slavko Kocjancic <eslavko@...>
Date: 2010-06-21

I'm print grid over entire page.
The error is randomly spread over entire lenght of paper.
..and near same amount with print on thick or thin paper.
.. just seems that paper shrink. When I print onto kimoto foil (looks
like semitransparent plastic) the random error is stil present but 0.5%
shrinkage drop to under 0.1%. but random error (wigling) stay near same
in both. I think that transport gear's teeth are uneven and that cause
that's problems.
Of course when printing text nobody will ever see that here is some
missalignment. But long row of connector can be out of order just
enought to prevent conector to be installed.



Andrew Villeneuve pravi:
> 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.
>>
>>
>