Sigma 18–35 mm F1.8 focus gear

A 3D-printable module 0.8 focus gear made for the Sigma 18–35 mm F1.8. Start from these measurements, check them on your lens, and download the ring for your own printer.

Saved measurements
Opening (inner diameter)	79 mm
Ring width	25 mm
Outside diameter (tooth tips)	100.8 mm
Focus travel, close focus to infinity	123.2°
Source	Owner draft · unverified

Measured by Focus Rings on our own copy of this lens and not yet confirmed on a second one. 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

Hard-stop ring

Calibration stops for your focus motor at both ends of the focus travel. This lens already has a measured focus travel.

€9.90

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

Wrap a tape once around the focus ring and compare with the opening above; the generator takes either.
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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