[Jan Mrázek]’s success with 3D printing a solder paste stencil is awfully interesting, though he makes it clear that it is only a proof of concept. There are a lot of parts to this hack ...

They solved the problem by adding an open solder joint for each wire in the epoxy-filled passages. For propulsion, attitude, and depth control, the CPS 5 has five brushless drone motors with 3D ...