Small cat with a circle made by his tail
~28mm high

Made in Blender 3D on base of my Cat from 
https://www.printables.com/model/170472-a-dog-and-a-cat-miniatures

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A tail was slightly reshaped after the print so it's a little different from what you can see on photo
Now the hole is little bigger

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You may try and print it smaller for an earrings but I don't know if this will work and how it will lookhanging from the ear

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Printed with 0.4mm nozzle
2 walls
15% infill
0.1mm layer hight (looks better and layer bounds are a little stronger than with f.e. 0.2mm)
Supports set to everywhere

Rust Copper PLA from Spectrum
on Voron 0.1