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Key ID Covers

Every keyring ends up the same way — a handful of identical brass keys you squint at, or try one by one in the lock. These covers slide over the head of the key and put a raised letter on both faces, so the right key is obvious at a glance. The ring passes through the key and the cover together, and that is what holds the cover on.

Two brass keys on a split ring, each wearing a gray printed cover with a raised J and X

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Every letter as its own STL, plus two projects with the whole alphabet already arranged on one plate — one single color, and one two color with the letters assigned to a second filament.

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The 3MF is the faster path — pick the single-color or two-color plate, open it and slice. A full print & use guide is attached to the Creality listing.

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Print & Use Guide

The same guide attached to the model listings, hosted here so you can read it before you print — PDF · 5 pages · 1419 KB

Open the Guide

What Makes It Work

The Letter Does The Sorting

A colored ring or a dab of paint works until you have four keys the same color. A letter keeps working however many keys are on the ring.

Two brass keys on a split ring, each wearing a gray printed cover with a raised J and X
Slides Right Onto The Key
The cover fits over the head of the key, and the key ring passes through both the key and the cover. That shared ring is what locks it in place — there is no clip to snap and nothing to glue.
Four gray key covers lying flat on a black textured surface, lettered X, J, S and H
All 26 Letters Included
A through Z, one STL each, so you print only the letters your ring needs. Want two letters or your initials on one? Leave a comment on the listing and I will make it.
The same four covers on a light gray surface, showing the raised letters and the open key slot along the bottom edge
Two-Color Ready
The letter stands proud on both faces, and on the two-color plate it is already assigned to a second filament, so it comes out crisp with nothing to paint in the slicer. In one color the raised letter still reads clearly, as every photo on this page shows.

Print Settings

Slice It Right

These are the settings the reference covers were printed with, on a Creality Hi with a 0.4 mm nozzle. The 3MF carries the full profile — open it in Creality Print or any slicer that reads 3MF projects and it is ready to go.

Print the set, not one letter. The whole alphabet in one color is 5 h 39 m and 42 g, about 13 minutes and 1.6 g a letter. In two colors it is 9 h 7 m and 128 g, and 86.05 g of that is purge and prime tower — paid once for the whole plate, which is why a batched two-color letter works out to only 4.9 g.

Each cover prints standing, 5.4 × 25 × 22.8 mm, with no supports and no brim. A single letter printed alone takes about 33 minutes.

Supports
None
Layer Height
0.10 mm
Walls
4
Top / Bottom
5 / 3
Infill
9% Gyroid
Brim
None
Material
PLA · 220 °C / 60 °C
The Part
5.4 × 25 × 22.8 mm · 42 g for all 26
Slice data for the whole alphabet on one plate: 5 h 39 m and 42 g in one color, 9 h 7 m and 128 g in two

More models and tested slicer settings on my Creality Cloud profile.

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Released under CC BY-NC-ND 4.0 — free for personal use, credit appreciated, no commercial use or derivatives.