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I 3d printed a custom sized keyboard using open source software and hardware designs.
(lemmy.dbzer0.com)
The design is based on the excellent Dactyl keyboard, generated with https://ryanis.cool/cosmos/ and it runs the excellent qmk firmware. It is handwired: 
and I have also made a palm support using inkscape and openscad 
All printed on a reprap prusa i3 derivative.
This helps me use my computer with less pain, so I want to call out all the wonderful projects and people who contribute to them which made it possible.
Total cost? $60 aud, amortised filament ~15 bucks worth maybe? and a lot of my time haha.
