Rope Valve
thingiverse
A remix of the Cam Cleat by metaform3d. I imported it into openscad, scaled it down to 75% and added an arm to attach an elastic band to make it positive that it would grab the rope if I stopped pulling. Also made the hole bigger so I could use a dowel as the axis. My prototype in the photo seems to work fine. I can pull the rope in only one direction.
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