This is the backplate that covers the tremolo springs of the Ibanez GIO guitar, but should fit many other Ibanez guitars with floyd rose tremolo. I made it to the same size and form as my original, that started cracking on the corners.
Make sure you take into account the shrink properties of your material and adjust horizontal expansion or scale accordingly. When in doubt, scale it to 100.2 or 100.3%, and you will be fine even if you overshoot it a little bit. In my particular case, I had to scale to 100.5% since the ABS filament I used shrinks quite a bit.