That solder paste extruder is a great idea. I have used these tubes of solder paste for
several years but always fought with expressing enough, but not too much, of the paste.
Tomorrow I will be in my workshop building one of your devices. I really like the concept.
It seems possible that the solder paste extruder could also be adapted to a CNC Mill
or a 3D printer and used with appropriate G-Code to place small solder paste dots
for oven-baking of components to the PCB.