Homebrew PCBs

I've stuck the thick Pulsar paper to regular paper and sent it through
my laser printers in the past.  However, even on just bond paper my
printers shrink the print a little, about 0.5% to 1%.  Are you seeing
a small even shrinkage, or random major shrinkage?  Can you measure a
reference print and compensate?  (assuming your software has that
feature, gEDA's pcb does).  Oh - and measure the toner on the pcb, not
the toner on the printer, as the rest of the process changes the size
a little also.

However, I have had cases where "card stock" (100lb, 5x thicker than
standard bond) has problems getting through my current laser printer.
It depends.