Bluetooth headphone

This is a bluetooth audio receiver for headphones. It also capable to play mp3 from microSD or pendrive.
Set the layer height to 0.3 mm. Use a 0.4mm nozzle. No support is needed.
You need to buy the same modules that I purchased, other modules may have different sizes:
- 1x Bluetooth receiver HW-329-B (whitout FM receiver) https://www.ebay.it/itm/123123382658
- 1x Li-ion charger TP4056 (with only a single IC) https://it.aliexpress.com/item/32904719549.html
- 1x Li-ion battery BL-5C https://it.aliexpress.com/item/32921747297.html
- 1x Toggle switch SS-12D00 https://it.aliexpress.com/item/32964400942.html
- 4x M3x20 bolts with countersunk head.
- 4x M3 nut.

Wiring are difficult because space is limited. Behind the TP4056 module it is necessary to put some insulating tape as it is in contact with the microSD reader. I made the battery contacts with the leads of a 1N4007 diode.
Lithium-ion batteries are dangerous, moreover several soldering operations are required so diy