Homebrew PCBs

Hi Phil,

Most of this mis-registration is caused by the paper changing size. The
misregsistration is much more noticable in humid climates, than in dry
climates. The heater in the laser printer will drive out any moisture in
the paper. If you print a blank page and then feed the same paper back
through the laser printer, then you should get better front/back
registration.

Printing on plastic, you generally don't have a problem (because there's
no moisture in the plastic to drive away). Ink Jets don't require heat,
which is also why they work well.

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/ 

> -----Original Message-----
> From: Phil [mailto:phil1960us@...] 
> Sent: Wednesday, September 29, 2004 4:41 PM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: [Homebrew_PCBs] Re: Laser Printer mods & Laser's
> 
> 
> 
> One thing that hasn't been mentioned in the list of problems to crack
> is alignment for double sided resist application.  I know that if you
> take a piece of paper, print on it and then print the same thing on
> the same side you will see some "mis-registration".  I'd guess its in
> the 10-20 mil range on my copier though I'm sure it varies with each
> printer/copier as well as the age of the transport mechanism.  My
> latest inkjet (canon pixma 4000) is suprisingly good on this front so
> it is possible.
> 
> I guess once we get to a working single sided application, some one
> will figure out double sided.