This script forces GitLab's front end to build the entire Git history for a project, then update necessary images, and finally rewrite the page with just the graph so it is suitable for printing.

GitLab Network Graph Exporter

(function() {
  var $graphWrapper = $('.network-graph');
  var lastScrollTop = 0;
  $graphWrapper.scrollTop(0);
  var dropInImages = function() {
    const replaceShots = [
      { // Sam
        'old': '/uploads/user/avatar/5/superman-logo-013.png',
        'newimg': 'http://localhost:9090/small_sam.png'
      },
      { // John
        'old': 'http://www.gravatar.com/avatar/a289396a38e2b9457243a16e500d7f73?s=20&d=mm',
        'newimg': 'http://localhost:9090/small_john.png'
      },
      { // John
        'old': 'http://www.gravatar.com/avatar/65f5ee1ec8f4636c6e8dae712d8d6a55?s=20&d=mm',
        'newimg': 'http://localhost:9090/small_john.png'
      },
      { // Chris
        'old': 'http://www.gravatar.com/avatar/ccee736221ce91fd8bc78ac81b59f03c?s=20&d=mm',
        'newimg': 'http://localhost:9090/small_chris.png'
      },
      { // Sean
        'old': 'http://www.gravatar.com/avatar/c17897aa15eda9299917492ea5701ccb?s=20&d=mm',
        'newimg': 'http://localhost:9090/small_sean.png'
      }
    ];
    $('.network-graph image').each(function() {
      var $image = $(this);
      var url = $image.attr('href');
      replaceShots.forEach(function(object) {
        if (url == object.old) {
          $image.attr('href',object.newimg);
        }
      });
    });
  }
  var finalize = function() {
    var svg = $('.network-graph').html();
    svg = svg.replace('xmlns="http://www.w3.org/2000/svg"','xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"');
    document.write(svg);
    document.title = 'Git History';
  }
  var scrollDown = function() {
    lastScrollTop = $graphWrapper.scrollTop();
    $graphWrapper.scrollTop(lastScrollTop + 300);
    if ($graphWrapper.scrollTop() > lastScrollTop) {
      setTimeout(scrollDown,500);
    } else {
      dropInImages();
      setTimeout(finalize,1000);
    }
  }
  scrollDown();
  return true;
})();