Yet another little bit...I have not been able to assemble the 4 wings, only two for the moment.It looks like some cleaning would do it... bah! I'll try to (change sizes, bigger! and) adjust tolerances.Mostly like its ancestor... print it "for the fun" if you like to do so but don't expect to do much more (yet) with this thing.Gap between nut and bolt is set to 0.8mm which works fine for me with PLA, I'm afraid that's too much for ABS.If you printed the wings (hahahahaaa) and now you print this you'll need six hands to try to assemble it, well, you can also try like I did with a piece of cardboard and some tape.