Instapaper-to-PDF is a simple script that prints PDFs of your Instapaper items. By default, it only prints PDFs for starred items.
Set your username, password, and desired path for saved PDFs in "instapaper_to_pdf.rb". Then run:
ruby instapaper-to-pdf.rb
Importing to DEVONthink and deleting articles from Instapaper after print are disabled by default. Uncomment the respective lines to enable them.
Suggestions and pull requests are more than welcome.