Enable print button for portal users

Hello community,

Is there a way to display the print button and allow portal user to download reports including fastreports. I tried giving access to specific objects and adding them in "List of objects available for portal users" lookup. After adding this configuration the print button is shown but I cannot download fast reports due to access rights and the following message is shown "Failed-Forbidden". 

This message is only shown for fast reports printables. Word printables are downloaded successfully. Is there something that I'm missing in the configuration?

Thank you,

Lirzae