Mini anthropomorphic robot servo MG90s/RCXAZ 9g

Mini anthropomorphic robot servo MG90s or digital RCXAZ 9g.
Position of the arm at the base most central.
Total cost less than 10 euros.
Uses five MG90S servo motors and a few screws.
The most economical for educational use.
M2.5 x 8mm screw to secure the motor arm (the one included is too short!).
Self-tapping screws included with the servo to secure it to the printed parts.
Optimized for 3D printing.
The only supports to be aware of are in the main cylinder.