FX-6

FX-6 was an FX-9 surgical assistant that built Grievous after the Kaleesh was involved in a gruesome shuttle crash that almost killed him and destroyed most of his original body.

In 19 BBY, FX-6 was present at the Grand Republic Medical Facility on Coruscant with a DD-13 medical assistant droid, 2-1B surgical droid, and another FX-9 surgical assistant. and performed blood transfusions during the reconstruction of Darth Vader following his defeat at the hands of Obi-Wan Kenobi on Mustafar. At some point after 12 BBY, FX-6, and the DD-13 and 2-1B medical droids, were moved to Vader's fortress on Mustafar, where they continued to design and implement improvements to Vader's armor under his supervision.

Text and facts from the “FX-6” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.