Canon 7D Tips: DIY Follow Focus Ring for Video/Stills – photoframd.com
Video: DIY macro photography with a $20 microscope lens and 3D printed adapter: Digital Photography Review
Amazon.com : SmallRig Mini Follow Focus with A/B Stops & 15mm Rod Clamp and Snap-on Gear Ring Belt for DLSRs and Mirrorless Cameras, Fits Different Diameter Lenses Up to 114mm - 3010 :
STL file Follow focus, Matte Box body adapter 15mm rods・3D printable model to download・Cults
3DFocus | Follow Focus Gears
3D Printed Camera Gear: Save Some Money! | All3DP
Add Follow Focus Gears to ANY PHOTO LENS for $35! - YouTube