Sorry to hear that. Still thank you for your challenge and sharing report.
I'd like to share my past test too, "Thingiverse - Cover xiaomi Amazfit bip" with PETG filament was almost fit( least not loose out, not move ) when I print with 101% size fix.
Because of this test I had been optimistic about existing BIP products with flexible material...
Now I'm not, give up to search BIP's one.
Although, there is good news that @Gordon unveiled the 3d model of bangle.js2 body on GitHub.
I change my direction to creating the original bumper from the data, with reference of above experience.
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