Recharchable 18650 Personal Massager

thingiverse

For the sore muscles. This rechargeable unit sure beats scavenging for good AA batteries. And the 3.7 nominal li-ion battery has a more ooomph than a pair of AAs! This is a bit of diy soldering to make work. The case is designed to friction fit together securely. It's not quite circular in x-section so there's room to run the motor and battery wires up one side. You may need to make your own motor shim to hold it securely and keep the business end from bumping into the end of the case. I put some folded paper between the top of the motor and the battery and used the battery/lid of the case to push the motor down inside. You may need to sand things a bit to fit together as it's designed to be tight. Everything except the button and charge port should be sealed with epoxy. Parts List: * 21mm diameter 3v motor * Power Switch: https://www.adafruit.com/product/1400 * One 18650 cell * 1s li-ion usb charge board like this: https://www.amazon.com/HiLetgo-Lithium-Battery-Charging-Protect/dp/B00LTQU2RK/ * 1s li-ion protection board: https://www.amazon.com/Anmbest-Charger-Protection-Lithium-Battery/dp/B07KSPYMJ2/ * Silicon awg20 power wire * Four small screws to hold the power switch in place.