Looking for Shopify app to create print on demand documents

[4mica]

Hey there, 

I'm working on a site that caters to creating custom forums for healthcare works. I'm looking for an app that might allow the customer to print large quantities from our site to regular pieces of paper that they can then use at their office after downloading the forum we've created for them.

Essentially, I'm looking for a printify type app, but for simply printing plain paper, and who handles the fullfilment. 

Any suggestions?