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Help designing a button?
(lemm.ee)
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this post was submitted on 03 Jul 2024
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Soldering is nothing like welding. Neither task is particularly hard, although welding takes a bit more coordination. Soldering is about as hard as using a hot glue gun or microwaving a meal, or scrubbing a toilet.
When you've never done it before, it is easy to build it up in your mind. Here's the things that matter:
An adjustable iron is nice, and you'll likely find that eventually you will use it for threaded inserts in prints. There is a lot of marketing about irons and junk, but it is hard to beat the value of one of the Chinese 936 Hakko clone irons. Most of the marketing junk is to try and obfuscate the value and availability of these clones. The Hakko 900 series tips are the defacto standard and there are many extra accessory options available that are only possible with this tip/iron type. Last time I checked a 936 clone is usually under $40. The actual circuit board required to build one is under $5 on AliEx while the iron handle and lead are ~$8. You don't need this for a basic job, but an adjustable soldering iron is a lifetime useful tool to have on hand.
Good solder makes a big difference on bigger projects when you're doing this a lot. However, if I was in a zombie apocalypse, I could easily make a single solder connection by heating the tip of a screwdriver in a candle flame, use some resin from a pine tree, and a chip off of the pewter candlestick holder to solder a button to a circuit board.
Buttons can be a bit challenging with 3d printing design. It depends on your goals, but clearances and textures matter a lot more than it may first appear. It is possible to get something that just works, but is loose or crude. Getting a button like the inserts that go into a typical video game controller are quite challenging to clearance and develop a consistent tactile feel. I've done this in practice and it took a lot more iterations than I expected.
I'll suggest Weller irons as a solid alternate as well, pretty much the only irons I've used in the last decade or so, mainly because the job I soldered in a lot used Wellers, had some lower end variable ones beat to hell in field bags that still run perfect today (actually my dedicated insert iron). I have a WE1010NA that I use now and it's a solid tool.
The issue with Weller is their price in a competitive market.
Considering no alternative the entry level Weller is fine. Ersa has their awesome itool with this really short distance between soldering iron tipp and finger grip: https://ts.kurtzersa.com/electronics-production-equipment/soldering-tools-accessories/soldering-desoldering-stations/produkt-details/i-con-pico-1.html
Performance: Weller and Ersa are more or less equal. For generic solder joints both are great. If there are high thermal mass and it isn't possible to use a large tipp than the Hakko T12 is the superior technology. Changing tips on the Ersa (while not recommended by the manufacturer) can be done with the iron heated up and tool free within 5 seconds.
Ergonomics: 100% Ersa. The only reason it has been my daily driver for half a decade and is here to stay. Before this station I actually had a Weller.
JBC has a similar tool handle to the Ersa but those are very expensive with little benefit.
The price to performance king are genuine Hakko T12 tipps with a China station.
Oh for sure, totally appreciate that Weller is pricey, and I'd totally expect good tips on a knockoff to perform well. For me it's going to come down to preference, wish I could try a bunch of different irons before buying, I at least had experience with wellers so I knew that I found them comfortable to work with and I'm not doing a ton of surface mount or fine stuff so meets my needs.