Magento 2 - Can't override pdf invoice class

I'm trying to customize the pdf invoice template, so I want to override the class that generate the pdf.

I found that these class create the pdf:

• Magento\Sales\Model\Order\Pdf\Invoice.php
• Magento\Sales\Model\Order\Pdf\AbstractPdf.php
• Magento\Sales\Model\Order\Pdf\Items\Invoice\DefaultInvoice.php

Then I check in the code and I found that the method I need to override are only in AbstractPdf.php and Invoice.php but the last one extend the abstract class so I decide to override the class Magento\Sales\Model\Order\Pdf\Invoice.php

To override what I need I created a module <Vendor>_<Module> with these files:

<Vendor>_<Module>\registration.php

<?php \Magento\Framework\Component\ComponentRegistrar::register( \Magento\Framework\Component\ComponentRegistrar::MODULE, '<Vendor>_<Module>', __DIR__ ); 

<Vendor>_<Module>\etc\module.xml

<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd"> <module name="<Vendor>_<Module>" setup_version="1.0.0"> <sequence> <module name="Magento_Sales"/> </sequence> </module> </config> 

<Vendor>_<Module>\etc\di.xml

<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd"> <preference type="Magento\Sales\Model\Order\Pdf\Invoice" for="<Vendor>\<Module>\Model\Order\Pdf\Invoice"/> </config> 

<Vendor>_<Module>\Model\Order\Pdf\Invoice.php

<?php namespace <Vendor>\<Module>\Model\Order\Pdf; use Magento\Sales\Model\Order\Pdf\Config; class Invoice extends \Magento\Sales\Model\Order\Pdf\Invoice { /** * InvoicePdf constructor. * @param \Magento\Payment\Helper\Data $paymentData * @param \Magento\Framework\Stdlib\StringUtils $string * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig * @param \Magento\Framework\Filesystem $filesystem * @param Config $pdfConfig * @param \Magento\Sales\Model\Order\Pdf\Total\Factory $pdfTotalFactory * @param \Magento\Sales\Model\Order\Pdf\ItemsFactory $pdfItemsFactory * @param \Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate * @param \Magento\Framework\Translate\Inline\StateInterface $inlineTranslation * @param \Magento\Sales\Model\Order\Address\Renderer $addressRenderer * @param \Magento\Store\Model\StoreManagerInterface $storeManager * @param \Magento\Framework\Locale\ResolverInterface $localeResolver * @param array $data */ public function __construct( \Magento\Payment\Helper\Data $paymentData, \Magento\Framework\Stdlib\StringUtils $string, \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig, \Magento\Framework\Filesystem $filesystem, Config $pdfConfig, \Magento\Sales\Model\Order\Pdf\Total\Factory $pdfTotalFactory, \Magento\Sales\Model\Order\Pdf\ItemsFactory $pdfItemsFactory, \Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate, \Magento\Framework\Translate\Inline\StateInterface $inlineTranslation, \Magento\Sales\Model\Order\Address\Renderer $addressRenderer, \Magento\Store\Model\StoreManagerInterface $storeManager, \Magento\Framework\Locale\ResolverInterface $localeResolver, array $data = [] ) { parent::__construct( $paymentData, $string, $scopeConfig, $filesystem, $pdfConfig, $pdfTotalFactory, $pdfItemsFactory, $localeDate, $inlineTranslation, $addressRenderer, $storeManager, $localeResolver, $data ); } /** * Draw header for item table * * @param \Zend_Pdf_Page $page * @return void */ protected function _drawHeader(\Zend_Pdf_Page $page) { // my custom code } public function getPdf($invoices = []) { // my custom code } protected function insertOrder(&$page, $obj, $putOrderId = true) { // my custom code } /** * Return total list * * @return \Magento\Sales\Model\Order\Pdf\Total\DefaultTotal[] Array of totals */ protected function _getTotalsList() { // my custom code } /** * Insert totals to pdf page * * @param \Zend_Pdf_Page $page * @param \Magento\Sales\Model\AbstractModel $source * @return \Zend_Pdf_Page */ protected function insertTotals($page, $source) { // my custom code } /** * Metodo per ottenere la data dell'ordine * * @param $order * @return string */ protected function getOrderDate($order) { // my custom code } } 

Finally I called these command:

• php bin/magento module:enable --clear-static-content <Vendor>_<Module>
• php bin/magento setup:upgrade
• php bin/magento setup:di:compile
• php bin/magento cache:flush

But when I go to admin and I tryed to print an invoice I still get the original template. I also tryed to put a die on construct of my custom class, but nothing appends.