This is a simple clamp for blinds that can be operated with one hand. Probably you can use it also for other tasks, but I didn't test it. I have attached the step file so that you can modify it yourself.
I have added a fuzzy skin in Prusaslicer at the clamping point. This works great and is absolutely necessary for this print, otherwise the string may slip.
Some grease is needed at the axis.
I printed it in PETG since PLA is probably too brittle.
Infill 100% for stability.
Good success and happy printing!
The author marked this model as their own original creation.