I designed a Chopstick Helper, because I didn't like the existing models. My design focuses on stability and should fit most chopsticks (see photos).
The holes are angled slightly to make the chopsticks spread apart a bit at the bottom.
Here are the print settings I used:
Resolution: 0.2
Perimeters: 14
Filament material: PLA or PETG
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Changes in V2:
Wall thickness at the holes increased for more stability.
Changes in V3:
Complete redesign to make it more flexible. Can be printed without support, if your printer is capable (see photo).