How Double-Shot Keycaps Keep Their Letters
A printed letter sits on the keycap’s surface, where friction from fingertips can gradually wear it away. Double-shot keycaps use a different approach: the letter and the cap are molded as two interlocking pieces of plastic. The legend—the letter or symbol on the key—is part of the material, not a coating on top.
Two Plastics, One Keycap
The process begins by molding one colored plastic into the shape of the legend. A second plastic is then molded around it to form the rest of the keycap. The two pieces fit together, leaving the legend visible on the top of the finished key. Because the letter runs into the cap rather than resting on its surface, ordinary typing cannot simply scrape it off.
The colors are chosen to create contrast, such as a light legend in a dark cap. The technique can also produce legends that let light through, a useful feature on keyboards with backlighting. The exact effect depends on how the keycap is designed and which plastic is used.
Durable Letters, Not Indestructible Keys
Double-shot construction protects the legend from the gradual fading common with surface printing. It does not make the entire keycap immune to wear: plastic can become polished and shiny from repeated contact, and a cap can be damaged by impact or harsh treatment. But as long as the keycap itself remains intact, its molded-in letter is not a thin layer waiting to rub away.
That is the practical advantage: years of pressing the same keys may change how the plastic feels or looks, while the characters remain built into the keys.
