Piezo Earphone

thingiverse

This is designed for connecting a piezo speaker with a crystal set. To hear the low signal from a crystal radio, you'll need a high impedance speaker. There are two body styles available. I prefer style 1.1. The measurements will need to be converted from mm to cm. The design was exported in millimeters, so the scale will require adjustment (X10). Cura does not read inches, so conversion is necessary.