Most of the filco keycap printing is silk printing which is a very common used printing way. To avoid fading of the letters, Filco put another "COATING" on the top of the keycap. Hence the touch of the keycap is more smooth than other company's keycap.
However, there're some of the Filco keyboards are made with laser keycap, for example, as far as I could remember, Filco Bluetooth keyboard(made by Datatcomp) and the newly released Filco white 104 keys keyboard, US Layout are both made with laser keycap.