Canon EF 70-200mm f/2.8 L IS II USM EF photo lens; focus ring focus gear

A 3D-printable module 0.8 focus gear made for the Canon EF 70-200mm f/2.8 L IS II USM EF photo lens; focus ring. Start from these measurements, check them on your lens, and download the ring for your own printer.

Saved measurements
Focus-ring contact diameter	88.7 mm
Clamp opening (+1 mm allowance)	89.7 mm
Focus mechanism	Focus mechanism not yet confirmed
Source	Imported · fit unverified

Imported reference data. Physical fit has not been verified by Focus Rings. Lenses vary between versions and copies: measure yours with a tape before printing.

Choose your ring

Slip-on focus ring

A slim module 0.8 gear with this opening and width, dimensions engraved inside. One STL, no account.

Free

Clamp ring

Three built-in clamps with M4 set screws hold it on the lens. STL, print and assembly notes, hardware list.

€9.90

Added hard stops are for mechanically coupled focus rings without usable end stops. They are unnecessary on lenses with built-in stops and unsuitable for focus by wire. This preset is offered for clamp and slip-on rings.

Several lenses? Every further clamp or hard-stop ring in the same order costs €6.90. Keep one outside diameter and your focus motor stays in place when you swap lenses.

Before you print

Check the focus-ring diameter on your copy. A tape circumference must be divided by π to obtain its diameter.
Print a free test ring first. Material, printer and shrinkage change the fit.
Module 0.8 teeth fit standard follow focus units and focus motors from ARRI, DJI, PD Movie and Tilta.
New to this? Read how to measure a lens for a focus gear.

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