The trajectory is published on a topic.
Every module publishes a new trajectory after it's done working with the trajectory.
So for example if you modify the trajectory, the output of this operation will be the full trajectory (`ram_msgs::AdditiveManufacturingTrajectory` type) being published on the `ram/trajectory` topic.
All you need to do is create a subscriber that listens to the trajectory topic. Each time a new trajectory is generated, modified etc.. you'll get a new message containing the latest trajectory.
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