So this is a cap to keep the diaphragm and mic body of the e604 from falling out the end when you plug a cable into it.

This is handy if some silly drummer smashed your $100 microphone and you want to get a little more use out of it before you have to buy another 3 pack of them from amazon.

I printed it in PLA, 100% infill, and superglued it on the end of the mic.

The mic now works, but is even more sensitive to getting smashed by drummers because the cap is made of plastic and there is no grill. Having no grill also may change the frequency response slightly.

Snare bottom maybe?