There are various production processes for mechanical keyboard keycaps, and here are a few common ones:

Printing process: This process is used to print characters or patterns on the surface of keycaps, usually using screen printing or laser printing technology. This process has low cost, but the printed letters may fade over long-term use.

Engraving Technology: This technique is to carve characters or patterns on the keycap surface, usually using chemical etching or laser engraving technology. The keycaps made by this process usually have higher quality and durability, but the cost is also higher.

Double-Color Molding Process: This process uses two different colored plastic materials to embed part of the characters or patterns on the keycap surface. This process can make very colorful keycaps, but it is also more costly than other processes.

Oil ink injection molding process: This process is to inject the color oil ink into the transparent keycap, forming a transparent sense of hierarchy. This process can produce very beautiful keycaps, but requires a relatively high level of technology.

PBT Double-Color Molding Process: This process uses PBT polyester material in the keycap making process, which is more durable, has better texture and is usually more dirt resistant compared to ABS keycaps.

Above are the common production processes of mechanical keyboard keycaps. Different processes make keycaps with different characteristics, so you can choose the suitable ones according to your needs.