43mm-67mm Lens Cap Holder — Thin Camera Straps, 8 Minute Print

Keeps your lens cap on the strap instead of in your pocket, in the bag, or on the floor of a parking lot. Prints in under ten minutes from whatever is left on the spool.

Fits — the cap

Any 43mm-67mm center-pinch lens cap. Retention is on the standard filter thread pitch, so the genuine and the third-party lens caps (Canon, Nikon, K&F, JJC, generic) all seat the same way.

Fits — the strap

Read this part before you print. Designed around the factory neck strap that ships with the Canon EOS R100 — 9mm wide, 2mm thick. That's the strap it was built for.

The loops flex, so a slightly larger strap may well work. Much larger won't. Peak Design straps, DSLR straps and most aftermarket straps are far wider than 9mm and won't go on at all. Measure yours first.

How it works

The loops are open, with a slit down one side. Push a loop against your strap, the slit flexes apart, the webbing passes through, and it springs closed around it. Friction holds it wherever you put it.

That means it goes on and off without unclipping your strap or unthreading anything — move it up or down the strap whenever you like, or take it off in a second.

No hardware, no supports, no post-processing.

Print settings

Good spool-ender or filament sample print.

If the fit is off

Printers vary. If the cap is tight, scale to 100.5% in X and Y. If it's loose, try 99.5%. If the loops are too stiff to flex over the strap, check your first layer squish before rescaling — that's usually elephant's foot rather than the model.

Files

STL, STEP and a 3MF with the print profile. The STEP is there deliberately. If you need a different cap diameter or bigger strap loops, remix it and post it back — I'd rather you have a version that fits than not print it at all.