Homebrew PCBs

Tried to run a test last night.  DIdn't go well.

For my first tests, I figured i would swap the CD tray with a PCB 
board the same width.  This would allow me to do some tests without 
any modifications to the printer.  However, the printer doesn't seem 
to act correctly.

The CD tray has some markings on it with White paint and ofcourse 
the tabs on the front edge.  I am guessing that either the tabs or 
the markings are somehow sensed by the printer.  

I have yet to open up the plastic yet as this printer is a bit more 
complex than normal ink jets.  All the crap needed to accomodate 
both paper and CDs seems to be "getting in the way" right now.  If 
this won't work for PCB work, I still need it for CD printing so I 
am hesitant to get too carried away with taking it apart at this 
time.

I will try to look for some additional sensors and such but if 
anyone has any ideas, I am certainly all ears at the moment!

Chris