Recommended · for some experience
DIY home-made SMT metal stencil - the definitive tutorial
Why people recommend it
Pointed to as a tutorial for making a cheap throwaway solder paste stencil at home by etching aluminium from a drinks can.
Watch for: Involves etching chemicals; suits low-volume boards
In their words
I might make it from a soda can like this video so I can throw it away and make a new one anyways if it become clogged with paint.
feehi on electronics.stackexchange.com, Nov 2016. CC BY-SA.