I used to do this in SS 2.4. Where I would create a new page and render it with a controller but never save it to the database. I would like to do this with SS 3.1 however I always get "page not found".
Here is what I am doing and I am wondering what would be the right way to do this?

class Machine_Controller extends ContentController {
	
	private static $allowed_actions = array('view');
	
	public $machine = '';
	
	private static $url_handlers = array(
               '$Slug!' => 'view',
	);
	
	public function init(){
		if (isset($this->urlParams['ID']) && is_numeric($this->urlParams['ID'])) {
			$machine = Machine::get()->byID($this->urlParams['ID']);
			
      if ($machine) {
      	SSViewer::set_theme(SiteConfig::current_site_config()->Theme);
      	$this->machine = $machine;
      	$tmpPage = new Page();
	$tmpPage->Title = $machine->Title;
	$tmpPage->URLSegment = $machine->URLSegment;
        $tmpPage->MetaTitle = $machine->MetaTitle;
        $tmpPage->MetaDescription = $machine->MetaDescription;
        $tmpPage->MetaKeywords = $machine->MetaKeywords;
        $tmpPage->ExtraMeta = $machine->ExtraMeta;
	$tmpPage->ID = -1 * rand(1,10000000);
	$tmpPage->Content = 'Test machine content';
	$tmpPage->CanViewType = "Anyone";
	$this->dataRecord = $tmpPage;
      }
		}
		parent::init();
		
	}
	
	public function view() {
		$data = array(
			'CategoryTitle' => $this->machine->PrimaryCategoryPage()->Title,
			'Title' => $this->machine->Title,
			'MachineName' => $this->machine->Title,
			'MachineDescription' => $this->machine->MachineDescription,
			'MachineOverview' => $this->machine->MachineOverview,
			'MachineFeatures' => $this->machine->MachineFeatures,
			'MachineApplications' => $this->machine->MachineApplications,
			'MachineSpecs' => $this->machine->MachineSpecs,
			'MachineOptions' => $this->machine->MachineOptions,
			'MachineNew' => $this->machine->MachineNew,
			'Breadcrumbs' => $this->machine->Breadcrumbs()
		);
		return $this->customise($data)->renderWith(array('MachinePage', 'Page'));
	}