We have plans to use several hundred Feather boards a work, currently we have around 100. Since I have to solder the stacking and female headers, which don’t work well with a breadboard for soldering, I designed this jig to hold them steady and straight while i solder. Thought it might be nice for the community. Thanks.
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Did you consider using press-fit connectors instead? If you have a mechanical press and a jig to support the work-piece it can be much faster. Not sure if a 3-d printed piece would work for the jig, I suspect it depends on the number of pins in the connector.