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tryadactyl
Methodology for custom tuning a concave, column-staggered, split keyboard with thumb clusters (AKA Dactyl). Centered on an OpenSCAD library for designing all sorts of ortholinear-ish keyboards supporting a variety of keycaps including Cherry profile. Additionally supports trackpoints, and 5-way navigation switches.
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InfluxDB
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in my openscad dactyl library (documentation coming soon, sry), i place the tops of the keycaps (not the keywells) which gives me the effect of your second picture, using cherry profile. it is of course possible to do a rotation in X before the placement around the cylinder / sphere / plane / spiral which would then (re)introduce a sculpted effect. i haven't tried it yet but it's definitely on my list of experiments.
the downside of this approach is that you need to model the keycaps but thankfully libraries like resheldiii's KeyV2 exist.