This is my version for a wing servo box for conventional mini servo 9-12grs (reference servo size were taken corona 929) and a 6grs size (powerHD 1600).
Those boxes keep the servos secure on the wing (foam board wing ) allowing easy acces to replace and reinforce the servo hole in the foam surface.

The weight of the boxes (important in a foamy) are 3,4 and 2,5grs including cover. Needs 2 little screw to fix cover to the box (same screws included on servos packages). The internal tabs keep the servo fixed and don't need internal screw or glue. The cover could be replaced with tape.
The boxes (wingbox) are simetrical but cover (wingboxC) not ,use mirror tool on your slicer program.

happy flights

UPDATE 3.12.2017 servo box for Hitec HS85 (two sizes HS85 has oficial dimensions and HS85x has a user dimension)

Anet

A6

Doesn't Matter

No

0.2, nozzle 0.4

100%

it doesn't need support, box base and cover external surface need to place on the bed,
keep resolution because the measures are multiples of these.
layers 1-1-1