Patent attributes
A maintenance system for a three-dimensional printer includes a platform configured to move along a first track. An ejector head is positioned opposite a first portion of the first track. A second track is coupled to the first track at a first position prior to the ejector head, and is selectively coupled to the first track after the ejector head at a second position. A controller is configured to operate the platform to move along the second track to the first position along the first track and past the ejector head, operate the platform to perform an operation on the ejector head, and operate the platform to move along the first track to the second position to enable the platform to return to the second track.