Topic: Week 3 Solidoodle II Print Challenge (glider)
Here is a glider to challenge you bed leveling and z screw adjustment.
http://www.thingiverse.com/thing:22268
Rotate 45 degrees on the z axis and shrink to 80% and it will fit nicely.
At 0.25mm layer height or similar, the wings are only 1 layer thick and see through.
I was lucky enough to nail mine first go, using hairspray and the fan to stop the edges from peeling up. Will post a pic later.