See how it flies: https://www.youtube.com/watch?v=0kYWvvdJrfI

Specifications
airfoil: KN209838/HM50T10% - twist: -5.5°
aerodynamic calculations: flight cpt. Florian Rösch
wing span: 1040 mm
wing chord: 173/130 mm
aerodynamic center 74 mm
wing overall weight: 310 g
wing area: 16,1 dm²
fuselage overall weight 270 g
wing loading: 36 g/dm²
longitudinal stability (Thies) STFs:
motor: Turnigy 2632 Brushless Motor 1000kv
motor camber: -3°
side pull: 2° right
propeller: Aeronaut CAM Aeronaut Carbon Classic 9 x 6.5" / 23 x 16.5 mm
static thrust: 500 g (3S Lipo)
battery: Turnigy nano-tech 950mah 3S 25~50C Lipo Pack
ESC: HobbyKing YEP 30A (2~4S) SBEC Brushless Speed Controller
receiver: OrangeRx R615X DSM2/DSMX Compatible 6Ch 2.4GHz Receiver w/CPPM
servos: Hitec HS-55

Print Settings
Attention
The wings are designed to print with 0.5 width, 0.3 hight and 2 bottom and top layer
If you print thinner, the perimeter of the upper side will not merge with the perimeter of the inner spars.
If you print thicker, the perimeter will not be printed continuesly in one turn.
The print must go as if you print in spiral vase mode. So you reach at least a smooth surface on the upper side.
If needed, you must try with 0.49 or 0.48 width. It depends on which slicer you use.
The second thing is, if you print with less layer hight, the inner spars will not connect the top and the bottom layer. There will be a gap inbetween.

All parts: layer height =0,3mm, width =0.5 mm
wing
1 perimeter, 2 bottom layer, 2 top layer, hollow
wing servo: 2 bottom layer, 2 top layer, hollow
aileron base: 5 bottom layer, spiral vase mode
aileron end: 2 bottom layer, spiral vase mode
aileron appendix: 1 perimeter, hollow
aileron interface: no bottom layer, spiral vase mode

fuselage
fuselage front: 7 bottom layer, 3 top layer
fuselage back: 3 bottom layer, 3 top layer
fuselage interface: 2 perimeter 0.4 no bottom/top layer, holow
fin: 4 bottom layer, spiral vase mode
fin cover plate: 2 bottom layer, hollow

Update 07.17.2016
The part "elevon_base_right_2.65.stl" was a wrong file!

Instructions

All sections of the wing are only hold together by two slightly elastic plastic cords inside the tubes.They are fixed with luster terminals on the wing ends.
There are only short joints to connect the parts.

Connectors 4 mm carbon tube
The holes for the connections are only parallel:

In the middle, between the wing_center and the two wing_middle_rigth/left
(50 mm in each side of wing_middle, 200 mm total at front tubes)
(60 mm in each side of wing_middle, 220 mm total at rear tubes)
At the servo segment
(45 mm in the middle_wing and 25 mm in the wing_right/left (110 mm total at the front tubes)
(50 mm in the middle_wing and 75 mm in the wing_right/left (165 mm total at the rear tubes)
At the wing end
(30 mm in the wing_right/left and 30 mm in the wing_end_right/left, 60 mm total)
The pipes must not be inserted deeper. There the holes bend and break very easily if you go deeper!

If you have to split the wing sections, the connectors will not be parallel, that means, you have to plug in the tubes one after the other, and see that you can get them out again, if needed. If both pipes are inside, the wings can not be pulled apart!