If you have tool bottle completely full (like me), original cover is not too reliable.
After the fifth caps loss during nine days , I started find solve this problem.
Model a new cap includes more precise thread and guide for to ensure a stable shape of the bottle.
Print settings.
nozzle: 0.4mm
layer height: 0.2mm
material: PETG
perimetres: 3
infill: 15prc
support: none
The cap was tested on 1300 kilometers of rides.
The author marked this model as their own original creation.