Keyring "thing" i called KeyCore. Don't know why....
thingiverse
A versatile design that doubles as a spacer for keys or a unique necklace component, featuring a 2mm hole diameter. Print Settings Rafts: Don't worry about it. Supports: Absolutely necessary. Resolution: Optimal at 0.1-0.2. Infill: Twenty percent is highly recommended. Important Notes: Tread with caution when removing this piece from the print bed due to potential brittleness in the joints between the outer and inner loop. Supports can significantly mitigate or eliminate this risk if added properly.
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