3D-4X was a silver-plated 3D-4X administrative droid.
3D-4X served Hekis Durumm Perdo Kolokk Baldikarr Thun on Mechis III. He acted as the butler for the manufacturing administrator on the volcanic planet. Sometime before 15 BBY, the escaped IG-88 prototype assassin droids arrived at Mechis III after having left behind the smoldering ruins of the Holowan Laboratories, and convinced 3D-4X to assassinate his own master.
- Therefore I Am: The Tale of IG-88 (First appearance)
- Young Jedi Knights: Delusions of Grandeur
- The New Jedi Order: Agents of Chaos I: Hero's Trial