The wires (or component, such as a switch or LED) are held by the flexible fingers so that you have two hands to hold the soldering iron and solder.
The springs added to the original design provide greater flex in the fingers and a wider range of sizes to be soldered.
The print came out nicely without support.
The photos show: 14 ga wire, 24 ga wire, a switch, and an LED.
The author marked this model as their own original creation.