I designed a replacement key for standard rubber dome keyboard keys. If your keys are no longer readable or have been damaged, you can easily replace them with this custom key. Just edit the text in the slicer to your desired key, and it's ready to print. After printing the clips, you need to carefully break the snap-in part free using pliers or another tool. Be sure not to deform the clip too much. Also, you need to glue both parts together. To do that, put some glue in the square slot and press the other part into it, aligning the notches for the correct orientation. 

If you want to print multiple keys, you can simply copy both parts. However, at the end, make sure to merge all the keycaps into one group and all the clips into a second group.
 

Tip: If you print the clip and the character on the key with translucent filament, your keys can glow again! :)