Door Opening Arm:
(2 ea) F693ZZ (3x8x4 mm) Flanged Metal Shielded Ball Bearing
Feetech FS90 120° 9g Micro Servo
Feetech FS90R 360° 9g Micro Servo | Continuous Rotation
threaded rod 4-40
(5 ea) hex nut 4-40
The Servo Coupling has two parts: First a servo horn that has been trimmed down to just the hub which is super glued into the round opening of the second Part which is the 3d printed ServoCoupling part. This allows a connection from the continious rotation servo to the hex nut which turns the threaded rod.