LEGO 45544 Mindstorms EV3 Battery Charging Dock Station For 5 Batteries 45501

Make your own DIY charging station for EV3 batteries. (LEGO 45544, 45501). This docking station can hold up to 5 batteries. Charging is provided via simple connectors and 12V DC power input. The actual charging circuit is within the battery itself, and it uses a Monolithic Power MP26123 IC that can accept between 9 to 24V. 

After printing the model, you will need:

• 5x 3.5 mm x 1.35 mm barrel plug connector (Aliexpress, eBay) - with thread
• 1x DC-099 5.5 x 2.1mm 5.5*2.1 DC Power Jack Connector
• 4x M3x6mm screw with countersunk head
• Some wires 
• Soldering supplies 

Print the model with supports, the Prusa i3 MK3S makes the bridges just fine, so don't worry about it. I recommend turning on the ironing, it makes the finish super cool.