Avian wing for Stackchan

This is a set of option parts for Stackchan, which gives flipping avian wings.
Stackchan is originally designed and developped by @meganetaaan.

See the following link for details of Stackchan: https://github.com/meganetaaan/stack-chan

This model requires:
M5Stack (Core Basic, Gray, Go, Fire, Core2)
Servo module for M5Stack
M5Go Bottom or GoBottom
SG90 servo motor (x 4)
Stackchan Body for SG90 and Go Bottom (https://github.com/meganetaaan/stack-chan/tree/main/case/contributed/mongonta_case_for_SG90_and_M5GoBottomBoard/case_for_SG90andM5GoBottomBoard)

[Note]: Servo Module for M5Stack is not available (EOL) in M5Stack official shop. Unfortunately currently available Servo2 Module is not suitable for this stl model because of its size, position and size of inlet of external power.
The avian wings option is not fit for the original stackchan body. Please use the revised model for SG90/Go Bottom shown above.

To extend flipping action, please extend length of servo horn.

https://www.youtube.com/watch?v=7fJO8pFpOBc