This section is designed to help customize the keyboard once it arrives. There are many different mods that can be done to personalize your keyboard. Some of them are aesthetic, while some of them change the feel or sound of your keyboard.
Keycap Material
The material of keycaps affects every aspect of them. The feel, sound, looks, and durability all need to be considered when talking about different keycap materials. Note that the aspects of each material will vary some due to composition differences, any coatings that may be applied, as well as the manufacturing/printing process.
I will be focusing mainly on ABS and PBT since they are by far the most common materials for mechanical keyboard keycaps.
ABS Plastic:
This type of plastic is most commonly used on keyboards. Most cheap rubber-dome keyboards will use ABS plastic, so you are likely familiar with it. Note that the ABS keycaps you are familiar with are not the same as high quality ABS keycaps. Custom ABS keycaps made by companies like GMK are some of the best keycaps in existence. So just keep in mind that PBT keycaps are not necessarily "better," and that it's pretty controversial when you really dive into it.
Below is an image of GMK Nautilus
Feel: Smooth, Can stick in a "squeaky" manner depending on the coating.
Sound: Higher Toned than PBT
Aesthetics: Look great until they begin to shine/yellow.
Durability: Durable depending on thickness, but begins to shine and yellow over time.
Other Notes: ABS plastic will begin to shine with prolonged use. This will also change the feel and looks of the keycaps. Along with shining, ABS will also yellow over time. Examples of yellowing can be seen on some of the vintage keyboards. Note: PBT plastic does yellow over time as well, it just takes far longer to do so.
Below is an image of ABS keycaps that have begun to shine.