XDA Keycap with Bump

I'm no 3d designer expert at all, hell this is my first "design" ever.

I needed a keycap with a bump so I uploaded freek2005's original file to tinkercad and added an extra cylinder object, size it down, put it on top of the keycap and joined the two pieces together. Cura says it's not watertight but it printed just fine for me!

If anyone could design it from scratch and upload it Ill be very grateful. Meanwhile this will do!

Enjoy