Hi Krikor,

In fact, i talked about the message 81173
"(...)
1. place the attached view.pdf.php file to components/com_k2/views/item folder
2. add a piece of code as in attached txt file to your item template (the template you are using for k2) like I used default template which comes with k2 (for mine the path was components/com_k2/templates/default/item.php )
(...)"

I made a view.pdf.php and tried to create a components/com_k2/templates/default/item_pdf.php

At the bottom of view.pdf.php i tried
parent::display($tpl);
and
parent::display('pdf');

Thx

Unfortunately this is a six year old post which includes a hack to K2's core. I would not recommend this solution.

A 3rd party service (via a button) or a plugin is preferable.

Finally i found the solution.

I added a view.pdf.php in components/com_k2/views/item
And added an iten_default_pdf.php in my override.

Kudos :)
Make sure to keep a backup of your edits.