Paracord / cord / rope lock

A regular spring is needed: 
Diameter: 4-4,5 mm
Height: 7 mm

Assembled dimensions:
Diameter: 9 mm
Height: 15 mm

Below are the settings I used:

Material: PLA
Layer height: 0.2 mm
Wall thickness: 1 mm
Wall line count: 2
Infill: 20%
Brim: 2 mm
Support: YES (tree)