The solder itself is fed from a spool in a regular bench top holder. If more slack is required in the solder feed, one simply pins the solder down in the device and tugs to draw more out.

Raspberry Pi cuts product returns by 50% by changing up its pin soldering Combining both the big and little solder jobs made a big difference.

If you are wondering what the syringe is for, half of it holds the solder spool and half of it acts as a guide for the solder. We aren’t sure why the SIM cutter was the base.