This follow focus system is lightweight and customizable to fit your specific lens dimensions. With its modular design, you can easily adjust and fine-tune the setup to achieve seamless focus pulls for professional-looking shots.

The beauty of this DIY system lies in its simplicity.. Its smooth and precise operation empowers filmmakers of all levels to capture stunning footage with confidence. 

This system was printed in PLA with 0.2mm layer height and at 100mm/s print speed and turned out very solid

For assembly is only 2x M3 and 2x M2 Screws are needed. For the case, that the plastic isn't gripping enough, you can use rubber band around your lens to provide better grip. For my printer all tolerances where fine, but you can adjust them with  sanding down the parts or wrap tape around the lens to slightly increase the Radius. 

For the electronics you can use a Rasberry Pi Pico or an esp32 to make stunning time laps recordings. I recommend using a Rasberry pi and use a encoder to manually focus the lens 

The four motors cost about 10 Euros at Amazon.

Dealikee 4 stücke TT Motor DC Getriebemotor Doppelwelle 200RPM DC 3-6V Getriebemotor für DIY Smart Auto Roboter : Amazon.de: Spielzeug