If I recall the price is around 1 dollar, if not less, and it will be enough to last you a lifetime. It is the same stuff used inside current day spark plug connectors on cars, and you can get a small packet at the checkout of you local auto parts store. Use enough to thoroughly encapsule the connector, you're basically wanting to keep the metal parts from contacting the air resulting in corrosion/oxidation. It will give the crimp tabs something more solid to sink into and hold onto.One thing that will help minimize, if not eliminate, corrosion at the connector is to separate the connector and apply a little dab of dielectric grease to each connector piece. Last aside: for anyone who doesn’t want to solder to the pin just solder the stranded wire before crimping it to the connector. You could always try it with a spare pin and scrap piece of wire to get the timing down if you’re really nervous about it. The biggest worry about soldering the connectors is having solder flow up to the retainer spring(s). Then check that the retainer spring is not soldered up. When in person I teach that saying the word “half” takes about half a second. Then lay the iron on for 1-1.5 seconds, which about when the flux will stop sizzling. Tin your iron with a tiny amount of solder–you can always add more. Then put a small pin drop of flux on the connector where you made the crimp to the wire. Crimp the wire into the connector–I forgot to mention that I crimp them as well, else they won’t go into the connector housing. The best way to solder them is to tin the wire so there aren’t strands going everywhere and so flow to the wire is not an issue. I made lots of different connectors when I was a mechanic, spent all the money on a couple handfuls of crimping tools and removal tools–molex, packard, deutsch, other brands–and I came to find that soldering was the best way to go. I have links to mouser for all the connectors and pins needed–so you don’t have to search around–plus a little how to on soldering and hooking up the connectors. Here’s a little write up I did when I got my e3d nozzle. This is all-of course–assuming you already have a soldering iron and decent soldering skills and don’t assemble connectors often so you don’t have all of the tools and stocks of extra pins and connectors lying around. And you don’t have to worry about faulty connections. Plus then you don’t need to buy the molex crimping tool. Just solder them in, it’s super worth the little extra time. Then you suddenly realize that you didn’t buy enough extra pins to rebuild another connector! So you have to wait for those to get shipped and a 10 minute job ends up taking you a whole week to finish. You will end up just cutting the whole connector off and starting from scratch. I ALWAYS solder molex connectors! Believe me if you spend the time to assemble it all up and then one of the wires pulls from the pin, then you spend the time to get the pin out without a molex removal tool–they are specific to the type of connector–or spend the time waiting for the removal tool to get shipped because you don’t already have one.
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