So I bought a new Happ stick for an old Supernova case and I couldn't hit the diagonals all of the time. The problem seemed to be that the shaft was hitting the edge of hole for the shaft and the actuator couldn't hit two switches at a time. I know you can flip the actuator to make it turn the stick into 4-way mode, but that wasn't the problem I was having. So I needed to make the hole in the case bigger, or make the actuator wider so that it can hit two switches at a time.
That's when I remembered I had a 3d printer that I don't use enough. The one of the left is the original actuator and the one on the right is that wider one I printed.
The first cylinder came out too wide but the second one came out perfect. The stick is now working great and now I'm spamming those fireballs like a real Ryu player