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Hi Wersy!

Thanks for info. I'll think what I can do. I have 4 mm carbon tubes and 2 mm rods from Hobbyking.com. All of them are 750 mm long.
Actually I can glue all sections of wing together and insert tube which will be shorter than wingspan only on 50mm or so. So, 25mm per side will be without enforcement. Not critical at all. As alternative idea I can cut head of nylon screw and glue threaded part into carbon tube from both sides and screw nuts on it on wing tips. Screw head in your case will be replaced on nut in my case. I'll think about it when all wing parts will be ready.

About my printing. I use PLA (eSUN) 1.75 mm. Width 0.4mm. Layer 0.2. Cura software (which I use for slicing) gives a worning if I put value 0.5 mm for shell width. With 215/60 degrees temperature I got good result even with single shell of 0.4 mm width. No crackings between layers. With layer 0.3 mm I have cracks. Just FYI. For some parts I had to recalculate number of bottom layers. Needd to remember yours 0.3 and my 0.2. So, maybe it better to provide bottom and top layers in mm than in quantity. For some parts I left just two layers as in your case.

Today I made test split of rear part of fuselage in OpenSCAD software (totally new for me) and got two STL files which I looked carefully in Cura on Layers mode. I realized that with width 0.4 mm fuselage has two shells with "air" between them. I enabled infill 100% and it looks Ok for me. I'll try to print at least one part with this settings and for comparison with width 0.5 mm but with zero infill. But I'm going to print fuselage when wing will be completed.

Currently I can't fit wing_servo_caps on wing_servo parts. Top side between rods not fit, walls meets each other. I'll try to sort it out by small file or sand paper. I'll let you know how it goes. Maybe it will be useful input from user of another printer than yours.

I'll purchase motor which you suggest. PRODUCT ID: T2632-1000 on Hobbyking.com. Correct?
I plan to use Zippy compact 3S 25C 1300 mAh battery. Weight 101 gr. PRODUCT ID: ZC.1300.3S.25. What do you think?

P.S. My Speedy will be blue or blue and black. :)