Iris keyboard keycaps

This is a set of keycaps for the iris keyboard with the default layout.

The stem has low tolerances, stringing or an untuned printer might make it unusable. Some post processing might be needed.

The following recommendations are made with slic3r/PrusaSlicer in mind:

* My recommendation is to use the "avoid crossing perimeters" option, slow speeds and print a single keycap and tune it until happy with the result.

* If you are using a nozzle smaller than 0.4 everything should print fine.
With a 0.4 nozzle the top and bottom walls of the stem will be missing with the default settings. This is usable but if you really want the extra support of the walls you will need to check the option "Detect thin walls".