5% infill is best, I remixed a cat model by:
aaaaaaaaaa13

https://www.thingiverse.com/thing:3850167/files

catwitch.stl

Coffee spoon holder, perfect to catch those pesky drips. I used 15% infill, no supports printed on its side. 

coffee spoon holder.stl

This file starts out small, customize the size in your favorite slicer.
I used Cura and printed it at 600% size.
10%in-fill, with supports.


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