WOW! This just looks amazing and beautiful. Maybe little creepy also. Still, it is a remarkable peace of work.
RC version with small electric engine:
Rubber band powered version:
Flying Crawler version: multiple wings and extra creepiness ...
http://blog.goo.ne.jp/flappingwing/ (in Japanese)
Here is very detailed guide on Instructables how to make and build your own 3d printed ornithopter: