Another board assembly from a closer perspective.

This is the assembling process of the second version of my RP2040-ADS1256 DAQ board. It takes some patience to place all the components in their place, especially the 0402 ones. But with a good tweezer and a microscope camera, it is only a matter of time. The reflowing was done on my DIY reflow station, which has been serving me for some years without issues. This process went better than the previous. However, due to the slight misalignment of the stencil, the paste was a bit offset at the USB connector, and I had to fix some solder bridges afterward. But the more I practice, the better the outcome becomes.
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[@KONTAKTS]

cool

[@CuriousScientist]

Thanks a lot!

[@large-heart]

In real life, the fact that chip mounts accurately capture chips on stored points...
And heat it to melt the lead...

[@CuriousScientist]

There's no lead here. It is a tin-based low melting point solder paste.

[@paulbarrow2497]

Is it silk screen printing of the solder paste?

[@CuriousScientist]

Do you mean the stencil?

[@paulbarrow2497]

@CuriousScientist yes I mean the stencil, with it being so tiny I think silk screen printing might be best

[@CuriousScientist]

Well, this is essentially the same procedure. Instead of ink, I spread solder paste through a sheet with holes on it.

[@Cronyxx]

What’s that gray stuff called?

[@CuriousScientist]

Do you mean the solder paste that I spread over specific places (tabs) of the PCB using a stencil?

[@Cronyxx]

@@CuriousScientist yes

[@CuriousScientist]

Chip Quik TS391AX50.

[@Cronyxx]

@@CuriousScientist thank you