Keyguard for Logitech MX Mechanical - Adaptive Typing Guide
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Drop-on keyguard for MX Mechanical: rest your hands without pressing keys. For tremor and limited finger control.
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- Creative Commons — Attribution — Noncommercial — Share Alike
A keyguard is a plate with one hole per key that sits just above the keys. You can rest your hands and fingers on it without pressing anything, and press a key only by pushing a finger through its hole.
Who it helps
People with tremor, spasticity or limited finger control (Parkinson's, cerebral palsy, MS, stroke recovery) who press neighbouring keys by accident
People who type with one finger, a typing stick, a mouth stick or a head pointer: the holes guide the tip onto the right key
Anyone who gets tired typing and wants to rest their hands without triggering keys
How it works
Drop-on, non-destructive: it rests on the flat top edge of the frame and a 2 mm skirt hugs the keyboard all around, so it can't slide. No clips, glue, screws or opening the keyboard. Lift it off to type normally.
The plate sits 1 mm above the keycaps: resting on it never presses a key.
110 holes, each 1 mm larger than the key top (15 × 16.5 mm for a standard key), with a 0.8 mm chamfer so the fingertip slides in.
Ribs between the key blocks keep the plate stiff under a resting hand.
Designed on the official Logitech MX Mechanical CAD dummy: checked in CAD with zero overlap with the keyboard, and every key has a clear hole.
Printing
The guard is 440 × 137 mm, so it prints in 3 pieces that each fit a 180 mm bed (A1 mini, Prusa MINI and up): 159, 149 and 145 mm wide.
Print them top face down as oriented in the files; no supports.
A1 mini, 0.20 mm, PLA: about 4 h 04 min and 142 g in total (1 h 22 min + 1 h 10 min + 1 h 31 min). Bambu Studio projects included. PETG works too; TPU is not recommended (it must stay rigid).
Assembly
Place the right piece (numpad and arrows) on the keyboard, then the centre piece, then the left piece. The skirt locates each piece.
The left and centre pieces meet along a stepped seam between the keys. They stay in place without glue while the guard is on the keyboard. If you want to lift it off in one piece, glue the seams with a drop of CA glue.
No extra hardware needed.
Editable source
Included: keyguard.py (build123d / Python, parametric: gap above keys, plate thickness, hole margin, chamfer, skirt clearance, split position) and a STEP of the full guard. For a person with stronger tremor, raise the plate thickness to 4–5 mm so the holes are deeper.
About this design
Designed in code and verified against the official reference model. Pictures are 3D renders; I have not printed it yet. If you print it, please post a make and tell me how the hole size works for you.
Español
Rejilla para teclado (keyguard) para Logitech MX Mechanical: una placa con un agujero por tecla, 1 mm por encima de las teclas, para apoyar las manos sin pulsar nada. Para personas con temblor, espasticidad o poca precisión, o que escriben con un puntero. Se apoya sin dañar el teclado y se imprime en 3 piezas.
العربية
شبكة توجيه للوحة مفاتيح Logitech MX Mechanical: صفيحة بها ثقب لكل مفتاح تتيح إراحة اليدين دون ضغط المفاتيح، لمن يعانون من الرعاش أو ضعف دقة الأصابع.