MX Toggle-Lock Modifiers: Mechanical Key Lock (One-Handed Add-on)
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A self-locking, 4-bar linkage exoskeleton for the Logitech MX Mechanical keyboard. It allows users to mechanically lock
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- Printables
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- Computers
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- Creative Commons — Attribution — Noncommercial
The Problem
Executing keyboard shortcuts (like Ctrl+C, Alt+Tab, or Shift+Click) requires pressing multiple keys simultaneously. For users who type with one hand or have limited fine motor skills, this simultaneous action is often a significant barrier. While software-based "Sticky Keys" exist, they can be unreliable across different operating systems or fail to provide clear, immediate visual and tactile feedback.
#OneHanded
The Solution
The MX Toggle-Lock is a non-destructive physical add-on that slides securely under the keyboard. It utilizes a mechanical 4-bar linkage system that functions as a toggle clamp.
Easy Locking: Press down on the rear lever (Bar 2). The mechanism lowers the striker (Bar 3) onto the target key and passes a mechanical "over-center" dead point. The key stays physically depressed without any continued finger pressure.
Quick Release: Simply lift the lever slightly upwards to instantly break the lock and release the key.
Visual & Tactile Feedback: Unlike software solutions, you can immediately see and feel exactly which modifier keys are currently engaged.
Printing & Assembly
100% 3D Printed: No extra hardware is required! The hexagonal pivot pins are fully 3D printable, making this a highly accessible project for anyone with a 3D printer.
Materials: Standard PLA or PETG works perfectly for all parts, providing the necessary rigidity for the clamping action and the structural integrity for the snap-fit pins.
Non-Destructive: The base structure simply slides underneath the keyboard frame. It requires no glue, screws, or permanent modifications to your Logitech device, fully respecting the contest guidelines.
Recommended Print Settings
Material: PLA or PETG
Layer Height: 0.15mm or 0.20mm (for precise tolerances on the pivot pins)
Infill: 15-20%
Supports: Required for the overhanging hooks
Orientation: Print the pins and bolts vertically (standing upright). I intentionally designed a chamfer on the hexagonal heads so the layers print at a slight angle. This smart design choice significantly increases the mechanical strength of the pins. I have stress-tested them thoroughly, and they do not snap under load with this orientation!
Happy printing, and enjoy a more accessible typing experience!