After purchasing a cap organiser the hooks provided kept sliding down loosing the equal spacing. also hooks were not holding the caps enough unless there was weight at the bottom of the line so i made my own. 

25mm webbing can be bought all over so can be made at any length you need.

I spaced each hook 280mm between each to allow caps to fin between.

Printed at 0.2mm with 20%infill for the hook and 100% for the retaining slide piece