It’s not an Ankylosaurus, it’s a Paleoscincus. It’s on Thingiverse at https://www.thingiverse.com/thing:5424027
This is part of the Monster Manual project I’ve been working on. Hope you enjoy!
https://docs.google.com/spreadsheets/d/1nAJ4y2JxQU2lb6jWOzqU9GdQtHIS4Z3P3NDHgOMEE9I/edit?usp=sharing