Update: I designed a full keycap set around this XDA profile (1U, 1.5U, … 6.5U): https://makerworld.com/en/models/227441
A simple XDA-style keycap. The top surface is not curved like some XDA caps because printing the curved surface would create ridges.
No supports and no brim needed. Print with the + facing down, and make sure to print with the smallest layer height (0.08mm) and enable ironing for the topmost surface for a smooth finish.
You can use the provided STL file if you wish to include letters or symbols on the keycaps. If using Fusion 360:
Printed with ELEGOO PLA Plus filament (colors black and white).