It's based on Tvorim3d (https://www.printables.com/@Tvorim3D) clothe peg design.
Im search for the best design in terms of durability and spring force, i made some tests:
Recomended print settings:
*Considering 0.4mm nozzle
Perimeters: 5
Infill: 0
Supports: No
Raft: Not necessary
Material: PETG
The author remixed this model.
The diffenreces is the shape of the spring in order to provide a nice deformation during loads.
With this design, the life time of the original clothe peg will be improved alot.
Tested only with PETG filament.