How to make a cord retractor mechanism?
So it is "a rope" and when you let go of it it retracts itself. It would be best without electronics.
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The simplest would be a role over which the rope runs and on the other hand a weight that is heavier than the rope. Rope out, weight up. Rope in, weight down. rope released, weight BONK. With a "land cushion" or a "fang rope" you can soften or avoid the BONK.
Otherwise, there are torsion springs, as in the watch lift, which can drive the one rope roller.
You could also "file" a vacuum cleaner with cable automatic to get an interesting part.