Celtic Salt Shaker
By MichaelDPatrick
Free
It's free to download
Videos
Images
Documentation
Technical
Using Openscad Celtic Knot Library by Mark Hindess:
https://github.com/beanz/celtic-knot-scad
and ISO-standard metric threads by
Dan Kirshner:
http://dkprojects.net/openscad-threads/
Related objects
Free