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Focus Rings

Free follow focus gear for any camera lens, sized from its diameter, plus paid clamp rings and lens caps

Focus Rings is a freemium browser tool for filmmakers who need a follow focus gear for one specific lens. The plain focus ring STL is free with no account or email; so are the Canon EF rear cap and a blank lens cap. Clamp rings and hard-stop rings are €14.90 (one Premium price for both options), and the other cap generators are paid. Exports STL. Last checked 31 October 2026.

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At a glance

Price: The plain focus ring STL is free with no account or email; so are the Canon EF rear cap and a blank lens cap. Clamp rings and hard-stop rings are €14.90 (one Premium price for both options), and the other cap generators are paid.
Runs on: Browser
Exports: STL
Multicolor: No, single color
Account: Not needed
Open source: No
Skill level: Beginner: fill in a form
Best for: Filmmakers who need a follow focus gear for one specific lens
Selling prints: Not allowed The terms give you the right to use the files for your own camera equipment and to print your own test and replacement parts; sharing or reselling the files and selling parts made from them is not allowed.
How we checked: Made and downloaded a file Downloaded the free ring at the default 76 mm opening and 23 mm width without an account: a valid binary STL with 27,472 triangles (103 teeth, module 0.8)
Checked by: Mike Janssen
Last checked: 31 October 2026

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Sources: Free focus ring generator, Focus Rings lens library, Focus Rings terms (checked 31 October 2026)

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What is Focus Rings?

Focus Rings is a browser generator for module 0.8 follow focus gears, the toothed rings that let a follow focus unit or a focus motor turn a camera lens. You type the diameter of the lens focus ring, or one full circumference measured with tape, from 40 to 110 mm, pick a width from 10 to 40 mm and set the wall: automatic, a fixed wall from 2 mm, or one outside diameter shared by all your lenses. The opening, outside diameter and width are engraved inside every ring, so you can tell your rings apart. A lens library on the site holds saved measurements for more than 200 lenses.

The plain slip-on ring is free as an STL, with no account and no email address. Rings with three built-in clamps or with hard stops for focus motors are Premium at €14.90, and the same site sells generators for lens caps, rear lens caps and camera body caps for nine mounts (EF, RF, E, Z, X, L, MFT, M and PL); the plain Canon EF rear cap and a smooth blank lens cap are free too. Focus Rings is made by Bernhard See, a filmmaker in Vienna.

The page recommends printing a test ring first and adjusting the fit for your printer, in PLA or PETG, flat with the axis upright.

What you can make

Follow focus gears for camera lenses
Focus rings with clamps or hard stops
Lens caps and rear lens caps
Camera body caps

How to use Focus Rings

Measure the focus ring of your lens with calipers or a tape, or look it up in the lens library
Enter the diameter or circumference and pick a ring width
Choose the wall thickness and check the preview
Download the STL and print a test ring in PLA or PETG