Update: Motorola posted the following tweet earlier today, which indicates that the engraving feature is coming soon to Moto Maker. The custom engraving option was removed shortly before the device launch after being heavily promoted.
Tweeps! Get ready to express yourself. Literally! pic.twitter.com/QzSBNhXe5A
— Motorola Mobility (@Motorola) November 10, 2013
We've known since launch that the Moto Maker customization tool for the Moto X wouldn't be an AT&T exclusive forever, and it looks like that period is just about to expire.