Unfortunately it's not possible to buy replacement keycaps for the AZIO retro keyboard due to a custom connection shape / depth. So when our work cleaner used a vacuum to clean mine, it managed to suck up six of my keys :-(

Here's my solution. No wording on the keys, but could easily add something. I did in red/black to they clearly stuck out.

Print Settings

Printer Brand:

Creality

Printer:

Rafts:

No

Supports:

Resolution:

.16

Infill:

Filament:eSun PLA Black / Red