then it will auto-feed when you warm it up with wire present (pic8.co).
I watched this example GIF for an hour and that solder never melted! No one has time for that! /s
Cool technique. I'll probably stick to my regular feed method as I have a rhythm and technique that works well for me, but Ill have to give this a go next time I spark up the iron. I'm assuming this works best with good old 60/40 lead/tin solder with a good quality flux core. That lead-free RoHS compliant (((solder))) is total shit and grows tin whiskers in cold environments.
Definitely, for soldering everything on a through-hole PCB this would be tedious. But for tricky joints where you don't have a clamp for the board, it could be useful.
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