Swinks,
Even though 0.9 sounds thin it can be hard to fit in to some machines. By the time you add double sided tape you will hit 1mm. I couldn't fit 0.7 in to a few machines because the tolerances can vary from machine to machine. With 0.9mm you are really going to have to move toys, plastics and ramps etc.
Try get thinner if possible.
:)
