need the name of an internal component.

hey team! Thanks for stopping by.

I have a Laser engraver build on the cheap end, and one of the components is malfunctioning. there are two laser guides from optical drives used for the X and Y-axis. on one of them, the plastic guide that moves along the head actuator is worn down, thus it needs replacing. if you could get me the name of the component so that I may purchase it, I would much appreciate it.

#Edit#

Upon a request for a photo, the component below is what I’m looking for.