Big Arrow Paddle D-Pad for Logitech MX Mechanical - Accessibility Add-on
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Four 24 mm paddles over the MX Mechanical arrow keys: press with a palm, fist or pointer. Clips on, no tools.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Computers
- Licencja
- Creative Commons — Attribution — Noncommercial — NoDerivatives
Four big paddles over the arrow keys of the Logitech MX Mechanical (full size). Each paddle is 24 mm wide and can be pressed anywhere, with a palm, a fist, a knuckle, a mouth stick or a head pointer; a peg under the paddle presses the arrow key. Made for people with tremor or reduced dexterity who struggle to hit a 13 mm key, and for anyone who navigates documents, maps or games one-handed.
How it works
Each paddle pivots on a piece of 1.75 mm filament at its outer end. At rest the peg just sits on the key under the paddle's own weight (about 4 g, far below the ~55 g the key needs), so there is no rattle and no accidental press. The key's own spring lifts the paddle back.
Tactile arrows are sunk 1 mm into each paddle, pointing the way they press, so you can find them without looking. The dished hub in the middle is a resting spot for a finger or a pointer tip.
It clips on without tools: a claw hooks under the front edge and the base stands only on the free areas of the top case (the strip in front of the keys, the empty area behind Up, and the 6 mm channel between the arrows and the numpad). No screws, no tape, and the keyboard is not modified.
Fits
Logitech MX Mechanical (full size, with numpad). Not the MX Mechanical Mini: its arrow cluster sits somewhere else.
Measured on Logitech's official MX keyboard CAD template (printables.com/model/1846004).
Parts
Base: printed upright with tree supports touching the build plate only (under the bridge), 2 h 07 min, 40 g on an A1 mini, 0.2 mm.
Four paddles (Up/Down, Left, Right), printed top face down, no supports: 18 min, 7 g together.
Also needed: four 21 mm pieces of 1.75 mm filament as axles.
How it was checked
Collision tests in OpenSCAD against the official keyboard model: the base does not touch any key or keycap, no paddle touches the base or the other paddles at rest or with its key fully pressed (3.2 mm), and a control test confirms the pressed peg does reach into the key. The peg slots are lengthened because the peg swings up to 1.6 mm towards the axle as the paddle goes down.
Assembly
Remove the supports under the base.
Put each paddle between its two posts and push a 21 mm filament piece through (tight in the posts, free in the paddle).
Hook the claw under the front edge of the keyboard and lower the base over the arrow keys.
Parametric OpenSCAD source included (paddle size, clearances, axle holes, the height above the keys).
About this design
Designed with AI assistance and checked in code before release (see above). Pictures are 3D renders, not photos. Not tested on a real keyboard yet: makes and feedback are very welcome.
Español
Cruceta de cuatro palancas grandes sobre las flechas del Logitech MX Mechanical (tamaño completo), para personas con temblor o poca destreza: se pulsan con la palma, el puño o un puntero. Se engancha sin herramientas.
العربية
أربع رافعات كبيرة فوق مفاتيح الأسهم في لوحة Logitech MX Mechanical، لمن يصعب عليه الضغط على مفتاح صغير. تركب بدون أدوات.