Hi moofitbaby,
I was also busy with the same thing and I just added my meta_key.
Go to /plugins/woocommerce-delivery-notes/templates/print/print-delivery-note.php
Put the following function on the place where u want to have your value with 1 parameter, your meta_key.
For example a have put my meta_key below my products on the invoice:
</tr><?php endforeach; endif; // END products ?>
<tr>
<td colspan="3">Ik houd rekening met 10% snijverlies: <strong><?php echo wcdn_get_order_custom_field( 'snijverlies' ); ?></strong></td>
</tr>
I hope this will help you, good luck!
