[weinzierl]

For the lowest cost alternative what is a reasonable estimate? Are we talking about USD 1 per key or maybe USD 5 or more? I guess I could find out if I tried to place an order at one of the mentioned services but it wasn't obvious to me how to do that without first signing up, actually customizing a set of keycaps and starting the order process.

[jupp0r]

Resin is in the order of magnitude of $30 per kg, so I'd assume the materials cost would be < $10 if you already have a printer.