Piezo Sounder Housing

I'm using a 20mm piezo sounder disc, also called a bender in a project that will have 3D printed housings. I've been using the Hemholtz formula to figure out possible sizes for the resonating chamber and the vent hole. I need to make a range of tones for different beeps, so it's a compromise.

In testing some designs, I discovered by accident that at least when 3D printed, it doesn't even NEED a hole. This makes my life a lot easier finding a place to stick this.

I added feet to it so I can glue it to the bottom of the PC board and none of the pins sticking through will touch the disc. For this project, I'm putting it directly under a button so it will actually support the board.

Running off a lithium battery and driving straight from a PIC processor port, it's loud enough to hear from the next room...

discs

Attachment 50099

My housing. The bottom is 1mm thick, the sides 1.5mm thick, the cavity 2mm deep and I printed the test unit out of PLA since I have it handy. The disc is glued onto the shelf with a flexible glue, I'm using Moment Crystal glue, but it's not critical.

Attachment 50100

Here's a picture of the completed speaker assembly
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Of course, you could make these housings on a lath or mill, too.

Attachment 50101

And how it will fit in my assembly

Attachment 50102