Key Beacons – Snap-On Tactile & High-Contrast Key Markers (MX Mechanical)
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Slip-on TPU markers with raised symbols and bright color, to find keys by touch or sight. 12 symbols.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Computers
- Licencja
- Creative Commons — Attribution — Noncommercial — NoDerivatives
Key Beacons are small snap-on markers that slip over single keycaps on the Logitech MX Mechanical keyboard. Each one adds a raised symbol you can feel and a bright color you can see, so important keys are easier to find without hunting.
Who it helps
People who find keys more easily by touch or strong contrast: low vision, reduced contrast sensitivity, or anyone who navigates the keyboard without looking down. It does not change key force, layout or software, and it has not been clinically evaluated. Accessibility is personal - treat these as building blocks and adapt them.
What's in the set
12 symbols for standard-size (1u) keys: dot, two dots, three dots, horizontal bar, vertical bar, plus, ring, three ridges, and arrows up / down / left / right. Example layout: arrow markers on the arrow keys, a dot on numpad 5 as an anchor, a ring on Esc, one / two / three dots to mark the start of each function-key group.
Non-destructive
Nothing is glued, drilled, opened or modified. The marker stretches over the keycap (TPU 95A) and lifts straight off again.
Based on Logitech's official reference file
The keycap profile was measured from Logitech's MXMecha_Dummy.step. The marker cavity was checked against all 92 standard-size keycaps in that file (every keycap vertex fits inside the cavity at nominal clearance; worst margin -0.006 mm). The default -0.15 mm setting gives a snug stretch fit. Meshes are watertight and the thinnest wall is 0.50 mm.
Please read - prototype status
I have not yet printed or fitted these on a real keyboard. Print the fit test strip first (5 markers from tight to loose, marked with 1–5 bars), pick the one that holds, and regenerate with that clearance if needed (one command, see the README). If you try them, a make photo or comment about the fit would help a lot.
Assembly
Print (TPU 95A, supplied orientation, no supports, thin-wall detection on, 100 % infill, 0.2 mm layers).
Hold the marker over the key, symbol facing up.
Press straight down until the skirt sits just above the keycap base.
Check the key still travels fully. Remove by lifting straight up.
Non-printed parts: none. Optional: removable adhesive putty (rigid prints only).
Editable source
mx_keybeacon.py - parametric Python (numpy only). Change clearance, wall thickness, symbol height, or add your own symbol, then regenerate every STL. (No STEP file: my tools could not export one.)
Limits
1u (18 mm) keys only in this version; wide keys such as Shift, Enter and Space are not covered. Two neighbouring keys can both carry a marker at the default fit. Marked keys sit 2.45 mm taller than the rest.
Independent project, not affiliated with Logitech. Logitech and MX Mechanical are trademarks of Logitech.
(pictures made with AI)