https://youtu.be/ihXxbQefl1c

Description

My previous design was an attempt to make an eye mechanism that was as accessible as possible to as many people as possible, but in this project I wanted to design something that was more of a middle-ground between accessibility and quality. This design features some more speciality parts such as servo ball-links and pushrods but it's still quite easy to build. It uses a mechanism design which is commonly used in professional eye mechanisms, but it circumvents any machining by using parts that are designed for 3D printing. Compared to my previous design, it is much more compact, robust, and a little lighter.

I strongly recommend this project over the other eye-mechanisms if you are able to buy servo ball-links and are happy with the quality of your 3D printing.

Supplies

• Screws: https://amzn.to/3Vmtrjg (this kit should cover you)
  • Around 40* M2 x 6mm screws
  • 6 10mm M2* screws
  • 6* MG90s servo screws (these come with the servos: https://amzn.to/33VfIlF)
• Hobby Components
  • 4 M2* Servo Ball-links: https://amzn.to/3TEbz1R
  • 4 M2 x 25mm* Pushrod Connectors: https://amzn.to/3Pl44uc (keep in mind this is just 2mm threaded bar - you could always cut down a 25mm bolt or some plain threaded rod)
• Electronics
• Arduino Uno: https://amzn.to/3VfGbYR (or anything that can accept three analogue signals, one digital and communicate through SDA/SCL ports)Adafruit PCA9685
• 16-Channel Servo Driver: https://amzn.to/4cijGsg
• 5V Power Supply, around 4A is more than enough: https://amzn.to/49Wqni0
• A female DC power jack to match your power supply, to be soldered to the servo driver board: https://amzn.to/43j0KFC
• 2 axis Joystick: https://amzn.to/2NR4JnY
• Potentiometer (optional): https://amzn.to/2r0nADS
• Push-to-make switch (Some joysticks have this built in, but its easier to control when it’s separate: https://amzn.to/32Wnvyh )
• 10k Resistor: https://amzn.to/374seRU
• Jumper cables: https://amzn.to/2NToCuw
• 6* MG90s servos: https://amzn.to/4afx4vv

Also, a pin vice hand drill might be useful for adjusting hole sizes: https://amzn.to/4afx7rb

Downloads