It costs less than 30 yuan to make a bone conduction Bluetooth speaker. The vibration motor of the iPhone 7 Plus is used as a speaker, with a total of ten speakers, five for each left and right channel. When attached to different objects, it produces different sound quality and effects.

There's no need to enable support for printing the model. The vibration motor requires removing two ears and attaching adhesive tape to the back to make it easier to install.

[3D Printing a Bone Conduction Bluetooth Speaker - Bilibili] https://b23.tv/4hZWKrq