Measure once.
Print a ring
that fits.

A free focus ring is a single STL. Paid ring files add your saved dimensions, print notes and, for clamp rings, a hardware list and assembly notes. You print the part yourself.

Any FDM printer that holds its dimensions, with a 0.4 mm nozzle and 0.20 mm layers. Slip-on rings and lens caps: PLA or PETG. Clamp rings: ASA with 6–7 walls, because it is much stiffer than PETG and keeps the clamps tight (PLA also works). Print a test ring first: material and calibration change the fit.

Yes. We print the parts ourselves in weather-resistant ASA and assemble clamp rings with their hardware. The print service is paused right now; send a request and we open batch orders within the EU once enough people are interested.

Yes. Every further clamp or hard-stop ring in the same order costs at least 30% less (lens set price). Keep the same outside diameter on all of them and your focus motor stays in place when you swap lenses. Share your lens measurements at checkout and save €2 once per order.

Rings use standard module 0.8 teeth. For hard stops you choose your motor or enter its tooth count, and the stops are recalculated. Check fit and movement on your rig before a job.