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Iridescent keycaps can be ordered on-demand at yuzukeycaps.com, where you can customise the keycaps to be exactly what you need for your keyboard! This doc has tips on how to use Yuzu .
For more information about Yuzu, see here; for more information about the set or any questions, see the GeekHack thread or my Discord.
Note: links in this doc include my Yuzu affiliate code, which increase the royalty I get from Yuzu on sales ^^
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Yuzu offers 3 pre-configured kits (similar to kits in a GB):
**Base kit - supports TKL keyboards, with a gradient function row**

**Mini kit - supports 60%/65% keyboards (6.25u spacebar only!), with a gradient numrow.**
Note: due to limitations on Yuzu, changing the layout/language does not work correctly with the gradient numrow. The Yuzu team is aware of this and hope to fix it in the future! For now, you would need to customize.

**Numpad kit - add on to base kit for full-size/1800 without fn row**
You’ll need to customize if your keyboard has a numpad with fn row.

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Keycap sets have very limited customization (only the language/layout - you can’t add or remove keys, or edit the legend/colour/etc on individual keys) but are a cheaper price compared to custom keycaps.
I would recommend seeing if any of the keycap sets fit your needs first, and only customise if you need to (e.g. your language/layout/etc is not supported) or want to (e.g. you want to adjust the colours, add more novelties, etc).
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Three ways to get started with making Iridescent custom keycaps:
For now, if you want to be able to choose from all the novelties or support multiple keyboards, I recommend 2. starting from a pre-prepared kit. You will need to spend extra time deleting the keycaps you don’t need so that it isn’t so expensive (Yuzu charges per unit of keycap, with some price breaks the more units you order), but adding multi-colour novelties from scratch is currently difficult, though improvements are on Yuzu’s roadmap. Also, ordering the same amount of keycaps in 1 “set” is cheaper than ordering it across 2 “sets” (of different keyboards).
However, if you want to change the language of your keycaps or are less familiar with keycap set kitting, option 1 will likely be easier overall.
Either way, you should be able to customise and get exactly what you want! If you run into any issues please feel free to reach out in my Discord, I’m happy to help ^^