I have seen a parametric keycap library here https://github.com/rsheldiii/KeyV2 https://github.com/rsheldiii/KeyV2 But standard FDM printing will not get you k

I have seen a parametric keycap library here https://github.com/rsheldiii/KeyV2 https://github.com/rsheldiii/KeyV2 But standard FDM printing will not get you keycap that are smooth on the top, as they tend to be sculpted to fit a finger better, and you're still looking at ~0.4mm layers at best. You may be able to do it with SLA 3D printers which are able to do higher resolutions than FDM printers. https://imgur.com/a/AalpV1r https://imgur.com/a/AalpV1r is an interesting project that 3d printed the keycaps too