I designed and printed an addon for the original cups so the 3,5mm connector could be housed in it and it would protrude through the Grado foam pads.
It actually “clicks” together but I used a small amount of double-sided tape to be sure.
I also removed the “back” foam inside the cups and I must say that they sound better in my opinion.
3,5mm connectors are a 3 pole design but I cut off the ground pin and soldered only the L and R to the driver.
The wire is a 2 pole design wire from aliexpress… Actually, the connectors and the pads are also from aliexpress.
The 3d printed addon just clicks to the cup
The flat spot on the cylindric connector extension is there because I print the parts directly on the build plate so it prints faster and so I don’t need to clean up the supports
The middle pin is removed because you don’t need ground and when you solder the wires to the negative and positive pins the connector is inserted in the 3d printed addon. It also just clicks in place so no glue needed.
The hole on the pads is made with sharpened pen body