18650 to 2c cells
thingiverse
Here's a way to convert a lithium 18650 battery into two C-cell batteries, perfect for upgrading your Nerf gun's power supply. You can also use this adapter in various other applications where you need a C-cell configuration. To build the adapter, I started by using an M3 bolt and nut along with a small spring to create the connector end. This setup allows you to easily connect and disconnect the adapter as needed.
Download Model from thingiverse
With this file you will be able to print 18650 to 2c cells with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on 18650 to 2c cells.