non-flat keyboard?

[Russ Nelson]

I use an ergo keyboard, the Kinesis Essential. It has two flat mini-keyboards (ctrl/alt/backspace/delete/home/end) and (alt/ctrl/space/enter/pageup/pagedown), and two dished keyboards. Frankly, dishing and PCBs are incompatible .... until now! If you print the key retainers in a dish shape, and use through-hole 49E hall sensors, you can vary the length of the leads so they are different heights above the PCB to match the dishing of the key retainers.

I'll try it and let you know how it goes.