Here are several images of a
Turritella shell printed on a 3D printer. The design was created in modeling software. Link here:
http://www.thingiverse.com/thing:13668
It was printed with glow in the dark PLA filament from 3D Solutech:
https://www.amazon.com/gp/product/B00ME7NHJ8/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
Here is a link to my friend Dave's blog showing a Cretaceous
Turritella fossil:
http://viewsofthemahantango.blogspot.com/2012/05/turritella-shell-mold-from-mt-laurel.html
Cretaceous
Turritella fossil from Mississippi:
http://louisvillefossils.blogspot.com/2013/04/cretaceous-turritella-fossil.html