Generic True Wireless Earphone Charger

After losing several charging cases for various pairs of true wireless earphones, after their cases slid out my pocket commuting to work, I was left with perfectly working earphones but no way to charge them.

I made this generic charger that should be able to charge multiple types of earphones. This is made possible by using a sliding switch that adjusts a movable charging contact point so that it can be aligned to location where the corresponding contact point is on the earphone.

 
To make the charger, I designed a 3D printable case to hold the components of a headphone charger I bought from eBay and took apart. The headphone charger was marketed as a “Charger For B&O Bang & Olufsen BeoPlay H5 Headset” (https://www.ebay.com.au/itm/394039725372). This charger also came with magnets to attract the headphone to the charger, so I made the design to use the same magnets. 

The device is comprised of three parts. The base, the top and the sliding switch/mobile contact holder. The base, in which the 2 mm brass inserts are placed and the main circuit can be glued to. The top, which also requires the use of brass nut inserts that can be fit with a soldering iron to hold one of the contacts in place and to hold a screw on which the adjustable contact mechanism slides. The third part being the sliding switch, which also holds the magnet.

This design needs improvement, so I am uploading with the Fusion360 file so that the community can easily re-mix and add improvements.

The following non-printed components are required:
 

4 x 2 mm Diameter Brass Insert Nuts

2 x 3 mm Diameter Brass Insert Nuts

4 x 20 mm M2 hex screws 

1 x 20 mm M3 hex screw

1 x 10 mm M3 hex screw