I made a Helldivers 2 helmet keycap based on helmest created by AverageArmadillo on printables and then I modified a basic cherry mx keycap for better stem connection after a lot of testing.

Printed on Monopriced Multi Maker with a cheap black PLA.
Slicer settings (Cura):

1. Layer height: 0.08mm Layer height
2. Nozzle size: 0.4mm
3. Temp: 195° nozzle - 60° bed
4. Print Speed: 15mm/s (super slow)