Exocomp

Who knew Mr. Potatohead could become an AI?

An exocomp is a type of of maintenance robot seen once in the TNG episode "The Quality of Life". They were prototypes that developed a limited degree of sapience.

Exocomps were small machines that could easily fit inside a 1 meter cube. They had anti-gravity devices for locomotion and a small replicator mechanism that could generate an assortment of tools. Their purpose was to fly through the ductwork (Jefferies tubes) of a small space station to perform maintenance and repairs. They were built with enough artificial intelligence to diagnose problems and determine how to correct them, but they developed sapience as an unforeseen side effect.

Oddly, this led to them not being allowed to be used on a general basis in the Federation. This is odd, because they would later have no problem sending possibly sentient human holograms, EMH mk1, to do menial work in mines and plasma conduits.