Jumpers are good for prototyping with Arduino boards. Combos provide a jumper for whatever you need. Simply remove as many wires as necessary and you have a multi-wire ribbon cable. I used them on a project to make quick connectors for stepper motors in several panoramic camera mounts. To make plugging and unplugging easier, I used 3D printed collars to wrap around the four jumper wires and the four stepper motor wires.
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