Since winter is nearly here and i arrive home in the dark.... It is a 50.50 chance that i grab the correct window blind pull cord. This object helps pull the odds back into my favor.
It mounts on the cord without needing to be glued.
There is a slot that the cord goes into and it is a friction fit.
I added a second version that holds the cord a bit tighter.
Printed mine in ABS, because thats what the machine has in it right now.
Minimal cleanup required, and i just sanded some sharp bits off.