Air foils. I put two in here, primarily in the \"print and be amused\" category, but there are some legitimate tests one might try with these:

• Mirror the hollow wing and glue them to a lasercut balsa fuselage to see if they work at all.
• Stretch some kind of airtight fabric over the frame, clip to balsa fuselage and see if it flies.

However, I must advise that anything printed in a ten-centimeter cube is going to be fighting the square-cube law pretty heavily, so even my nigh-gossamer wingfoil may just not be able to get up lift.

You'll need to snip the little supports I put on the frame to keep it from falling over (which it may do anyway) during printing.