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I love your idea of adding holes for an elastic band - I should modify the original parts to add this.
Funnily enough, Rosie
amp; I printed a pink
amp; black one yesterday (see Made One photo). The black sections are fine, the pink ones are lose. We printed the pink ones first and assembled them while still hot, the black ones were done when they'd cooled down.
Maybe the different colours print to slightly different sizes
amp; stiffnesses; I'd guess that assembling while the parts are cold is safest.
Good luck with the printing and thanks for the suggestion.