What is the purpose of a rotary engraving attachment?

With the rotary engraving attachment, you can use your laser engraver to process tumblers, cups, vases, and bottles of various sizes and diameters.

When the rotary engraving attachment is inserted, the axis movement in the Y direction is replaced by a rotary movement. With the special roll attachment, you can even process objects with large or small openings that do not fit into the cones of the standard configuration.

-Josh Stephens, Trotec Laser