10% with 3 layer of shells
All part have been tested with ABS filament and default setting of Makerbot 2X printer. I guess that it will work with PLA but I've not tested it.
Insert put the lever into the main tube (it has to be inserted from inside the tube)
Insert the toothpick to fix the lever to the main tube.
Fix the rod to the lever and the servomotor
Fix the servo motor to the main tube using the double sided tape
Put the protecting plate on top of the main tube and fix it with screws
1 x micro servomotor (ex: hitec hs-55)
1 x toothpick
5 x M 2.5 screw
some double sided tape