This object is made for checking the level on the build platform on Replicator 2x. It could easy work on other 3D printers to. You just need to scale it to the build platform size of your 3D printer.
It will also show how good your print will stay on the build platform.
The height is only 0.3 mm so it would work on all normal print settings.

I made this with Autodesk 123D Design.

I made one more object for testing:
http://www.thingiverse.com/thing:80227

You can also see guides and other help on my wiki+ site
:http://makerbotwiki.com/