Typically, clothes pegs die having been in the sunlight too long here in New Zealand. So, I designed these as a pair to be fitted with a spring from a broken one. Printed with 0.6 nozzle at 0.4 first layer and rest 0.3 Arachne perimeter with Prusa slicer.

They would probably be Ok with Classic settings too.

 To fit the spring hold the 2 finger ends of the peg together, slip on the spring ends and squeeze the active end and push the body of the spring in between the finger arms until it snaps into place. See pics