This is the Antlion Greatsword from the video game Grounded.

This 3D printable file isn't endorsed by Obsidian Entertainment, Inc. and doesn't reflect the views or opinions of Obsidian Entertainment, Inc. or anyone officially involved with making the Antlion Greatsword. The Antlion Greatsword and Obsidian Entertainment and all related logos are trademarks or registered trademarks of Obsidian Entertainment, Inc.