Fortunately positional accuracy doesn’t have to be absolutely perfect as the solder will flow to the pads. In factories they will often use an automated machine to apply the paste with a squeegee.

The Liquidyn P-Jet SolderPlus jetting system from Nordson EFD includes a jet valve and pre-qualified jetting solder paste formulations. (Photo: Business Wire) ...

While using a stencil should make solder paste application onto PCBs a simple affair, there are a number of “gotchas” that make it more art than science. Luckily, there are tools you can build ...