Limbo: Ergonomic Keyboard

Limbo is a slim, portable concave keyboard you can take around with you! It has similar curvature to the dactyl keyboard design but more aggressive stagger, since it's designed for the home row keys to rest right under my fingers when relaxed.

I've uploaded to here the version I printed. I used a USB-C Pi Pico from AliExpress as the microcontroller to receive the keypresses and interface with the computer, PJ-320A audio jacks and a 3-pin TRRS cable to connect the two halves, and choc keycaps from YMDK. I also used Choc Browns as switches, which was a terrible idea (they require lots of force to press and have annoying stabilizers). I recommend you do yourself a favor and find a different switch that's to your liking.

I mentioned the columns are staggered to match the lengths of my fingers, but if you'd like to re-fit the keyboard to your hand, you can scan your hand and edit the keyboard using my tool Cosmos. You can also use Cosmos to change out the microcontroller, fit to a different set of keycaps, or add encoders/trackball/trackpads/joysticks. I've also put more information about the build on the Cosmos showcase.

For printing the keyboard:

1. Start with the Limbo-Case file. Then you can put in your choc switches and get a feel for the keyboard.
2. The Limbo-Holder file holds the microcontroller and TRRS jack.
3. Finally, you can print the Limbo-Plate.

All the uploaded files are for the right side. Simply mirror them to print the left side of the keyboard.

Other hardware that's needed:

• M3 screw inserts and M3 flat-head screws for attaching the case, microcontroller holder, and plate together
• 10mm silicone pads to stop the keyboard from sliding around
• I used Kailh choc hotswap sockets so it's easy to replace the switches, but you could also solder directly to them
• Diodes on every switch to prevent key ghosting