Floating Arrow-Key Guide Hood - Logitech MX Mechanical
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Floating guide hood for the arrow keys - helps tremor/low-dexterity hands land on the cluster. Never touches a key.
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- Computers
- Licencja
- Creative Commons — Public Domain
Floating Arrow-Key Guide Hood — Logitech MX Mechanical
The problem
The arrow-key cluster on the MX Mechanical (Left / Down / Right + Up) is packed tightly against neighbouring keys — real spacing is only about 19.05mm between key centres, with roughly 1mm of actual gap between caps. For someone with a hand tremor, reduced fine motor control, or limited dexterity, the most common error isn't confusing Left for Down: it's missing the whole cluster and landing on the spacebar, the numpad, or the Home/PgUp block right next to it.
The solution
This is a small hood that floats about 1.3mm above the resting keycaps. It never touches a key, moving or otherwise. Six short legs rest on the bare, flat deck around the cluster. A single T-shaped funnel opening (matching the real shape of the Left/Down/Right/Up cluster) is narrow near the keys and flares open at the top, especially on the side above the Up key where there's plenty of open desk space. A finger reaching down off-target gets guided back over the cluster before it descends onto a key. The inner T-shaped rim also works as a tactile map you can feel without looking.
Why not separate wells around each individual key? I measured the official Logitech reference CAD file directly (ray-cast against the real geometry, not eyeballed) and found only ~1mm of true gap between adjacent keycaps. That's not enough room to print a structural wall between Left/Down/Right/Up: any attempt either collides with the keycaps or needs a wall under 0.5mm thick, which won't survive handling. The floating-hood approach is the geometrically honest solution given the real spacing.
How it was verified
All coordinates were measured directly from Logitech's official reference STEP file (ray-casting the real mesh, not estimated).
The finished design was checked against that same reference mesh at 88 vertices and 30,000 sampled surface points — zero collisions with any keycap.
I don't own a physical MX Mechanical, so I also cut a small "test fixture" STL directly out of the official reference file (just the local arrow-cluster area) so anyone can print a cheap, quick swatch and physically check the fit before committing to the full keyboard. It's included as an extra file, completely optional, but useful if you also don't have the keyboard on hand for testing.
Who this helps
Anyone with a hand tremor, reduced fine motor control, low vision, or limited dexterity who relies on the arrow-key cluster for navigation (text editing, spreadsheets, gaming, general cursor movement) and currently has to slow down or double-check before reaching for it.
How to attach it
No glue, no clips on the keyboard body, nothing touches a keycap.
Simply lower the hood over the arrow-key cluster.
The six legs land on the flat deck around the cluster. You'll feel it settle flat.
To remove, lift straight up from the small tab hanging off the front edge.
Print settings
PLA or PETG, supports needed.
3–4 perimeters recommended (the hood walls are thin by design).
Standard 0.4mm nozzle is fine (unlike some finer add-ons in this contest, no special nozzle required).