Laravel database seeding model factory one to many to one

I'm trying to seed the database through the model factory. It is no problem to fill the tables, but the data has to be one to many to one. So 1 project, has 1 or more sites, and these sites are on a server. I figured out how to make a relation with 1 to many but not how to use that same data for the many to one again. Here's my code:

$projects = factory('App\Project', 5)->create();
$servers = factory('App\Server', 5)->create();

$projects->each(function($project)
    {factory('App\Site', 2)
        ->create(['project_id' => $project->id]); 
    });

So the question is how to add the sites to the server.

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