One lab, multiple robots, multiple independent projects

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Can you say why? What problems does it solve? What problems does it create? Right now I have it working apparently fine with name spacing. Thanks.

Running a separate roscore for each robot doesn't require namespacing or TF prefixes.

Obviously we want the different student projects not to interfere with each other.

And it also automatically isolates each robot -- and connected ROS nodes -- from each other.

Nothing prevents anyone from using the namespace of a different robot and mucking things up.

Using a separate master makes this much harder (not impossible, as it's a form of security-through-obscurity, but still).

Thanks @gvdhoorn. Much better than actual answer. My robots have just a raspberry pi. Would running core on them be a cpu or memory load problem do you think?

A master does not use significant amounts of CPU, it should be fine.

Unless students start using parameters as topics -- which I have seen -- but that would obviously be a no-no in any case.