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A comment on Ultrathin business card runs a fluid simulation. Parent comment

Re:Ultrathin business card runs a fluid simulation by JKCalhoun on Friday August 08, 2025 @10:30AM (#44837442)
Yeah, wondering how the LEDs were aligned so precisely. Some kind of silicone grid-like jig to hold them while the solder reflows? Or is it just pick & place robotics doing what they do with precision?
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Re:Ultrathin business card runs a fluid simulation by triactual on Friday August 08, 2025 @10:59AM (#44837810)
The surface tension of the solder will pull them into alignment if the pad shape and solder volume are correct.
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