In general inkjet printers give far superior dimensional stability than laser
printers. The repeatability and accuracy across an A4 page is under 0.1mm on my
Epson 660 (i.e. better than what my eyes can see aligned up against a ruler).
This is on transparency, where water absorption in the polyester film is nil.
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With ink jet printers, you're adding moisture to the page, which causes it
to expand. Here, the amount of ink makes a difference (more ink = more
expansion). The grain of the paper will cause different amounts of expansion
in either dimension. Things should shrink back up a bit once the ink is
completely dried.
I wouldn't expect transparencies to be affected on an ink-jet (except for
heating effects, which should be much less than a laser printer).
Dave Hylands
