MX LightPress – Low-Force Compliant Key Levers + Tactile Tips for Logitech MX Mechanical
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Compliant low-force levers for Space, Enter & Backspace + swappable tactile tips. For weak, painful or shaky hands.
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- Computers
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WHO IT HELPS
People who do not have the strength to press a key reliably: arthritis, ALS, muscular dystrophy, stroke survivors. Also people who type with a fist, a palm, a mouthstick or a typing stick, and low-vision users.
HOW IT WORKS
Each "station" is a lever with a printed flexure hinge that clips onto the front edge of the keyboard. You press a large tip in front of the keyboard; the lever presses the key for you with a force reduction of 3.2:1 to 4:1.
Calculated pressing force (to be verified with a kitchen scale), compared with 43–55 g without a lever:
- Space station: about 14–18 g
- Enter station: about 10–13 g
- Backspace station: about 6–9 g
The 3 stations cover the keys most used with an on-screen keyboard and word prediction.
ENGINEERING DETAILS
- Flexure hinge 0.6 × 6 mm with root fillets. It is printed in-plane, the most durable orientation for FDM.
- Hard stop at 2.2 mm of key travel: the key actuates at 1.3 mm but never bottoms out.
- The long levers are lightened with a truss, so that resting weight stays at least 12 g below the lowest switch tolerance (33 g). There are no accidental presses.
- Universal 10 × 5 mm tip interface: every tip fits every lever.
- Clips are generated from the official Logitech CAD file. Non-destructive: they clip onto the front edge.
- Fully parametric Fusion 360 file: ratio, hinge thickness, key position, stop.
TIPS LIBRARY (target size ≥ 24 mm, research-based for motor impairments)
- Palm pad 34 mm (TPU) with a raised bar: Space.
- Round cup with cone: Enter, for a mouthstick or stylus.
- Tactile cap with a 3-dot arrow: Backspace.
- Large 60 × 40 mm paddle for a fist, an elbow or a foot.
Shape coding (square / round / arrow) plus high-contrast colours lets blind and low-vision users identify each key by touch.
TREMOR GUARD (optional)
A hand-rest bridge with a rounded window above the Space pad. Rest your hand, then guide one finger into the window. It stands on the desk; nothing touches the keyboard.
NO HARDWARE NEEDED
Levers snap onto printed pegs.
ASSEMBLY
1. Press the lever anchor onto the two pegs of its frame.
2. Push the chosen tip onto the end of the lever.
3. Hook the clip under the front edge of the keyboard, then rotate it down until the lip sits on the front strip.
4. Check that the pusher rests on the key and that the lever moves freely.
NOTES
- Designed on the official ANSI reference. For ISO/AZERTY layouts, adjust the e_key_x and e_key_z parameters for the Enter key.
- On a real keyboard with rubber feet, check the 1.2 mm under-hook. Reduce hook_t if needed.
- Not yet physically test-printed: makes and feedback are very welcome!
IMAGES
All pictures are Fusion 360 renders of the CAD model. I did not have time or access to a physical Logitech MX Mechanical keyboard to photograph prints, so the hand, hook and mouthstick shown are illustrative stand-ins, not real photos.