So the solder paste dispenser is finally ready for daily use and tested.

In normal mode:
- middle button pulls (retracts) the paste with maximum speed while the button is pressed
- right button pushes the paste (first with maximum speed for retract duration and after that with user defined speed), when released it immediately retracts (pulls) the paste for user defined time.

Other modes are just configuration of speed and retraction time.

Configuration of push speed
and configuration of retraction duration:

And here is the first result (PCB milled with my CNC3018PRO, isolated current sensor 50A)

Im very satisfied with the result - the whole process of soldering with solder paste needs a bit of practice but it makes the PCB assembly much more efficient than with solder wire.