See the fantastic original by Byte Insight for more info.
I found the original is challenging to print with colour, as the letters are overhangs… so it drooped with the different colour material. I remixed it with the letters flush against the bed.
Printing
With my slicer (Bambu Studio), I pull both files in at the same time. The slicer asks me if I want to use them as a single model, which I select YES to. They two files then be positioned correctly in relation to each other. Then you select which colours you want to print them in from your multi-material system :).
About
I took the original, dropped it into TinkerCAD, and used it to make the letters 😺.
Licence
Copied the original author's licence.
The author remixed this model.