A 3D-printed hollow tube has a wire ferrule inserted in the end, which serves as the tip of the device through which solder is fed. The tube has a cutaway, which allows the user to feed solder ...

which depends on a little prep work to end up only slightly more complex than soldering to copper. A typical way to make a reliable electrical connection to aluminum is to use a screw and a wire ...

Grip the copper pipe firmly in one hand and tuck one end under ... when soldering. It ensures a secure, leak-proof joint. Clean the inside of the copper pipe fittings with a special wire brush ...