This is my second wing, and - it even flies :-) Even a looping, not really round but for the beginning not so bad: http://youtu.be/XIrR3X5ENus Here is another video which is made by a friend. He added some videos of printing some parts of the plane and some stills of the preparing for the flight - and a wonderfull music that makes you feel as if the plane hovers almost weightless in the sky :-) http://www.youtube.com/watch?v=ut_Ei22on58 This wing has straight middle sections, so that the carbon tubes can go through. That makes them much more stronger in that section which is especially loaded. Here affects the maximum bending moment. I pushed this problem more to outside, where the bending moment is much less. I designed new wing sections for those critical points. It has a structural infill that makes this parts much stronger and even pretty light. The wingspan is 1600 mm, 50 mm more than my first wing which I published before: http://www.thingiverse.com/thing:86982 And now - one year later, I finished my big aerobatic wing plane: http://www.thingiverse.com/thing:407766 and http://www.thingiverse.com/thing:453090The methode to build the wing is the same as to the first wing. Just print the rest wing sections in sizes you prefer and and of course the wingtips. Besides of the middle sections you need 2x 450 mm and 2x 270 mm of wing sections. Carbon Tubes 1x 8/6 mm (outer/inner diameter) x 1000 mm long - (for the middle wing) 1x 8/6 mm (outer/inner diameter) x 307 mm long - (for the wing end sections) 1x 4/3 mm (outer/inner diameter) x 1000 mm long - (for the middle wing) 2x 4/3 mm (outer/inner diameter) x 297 mm long - (for the wing end section)