Batch printing using Applescript - no longer works

Question

For several years I have been using a simple Applescript to monitor the contents of a folder, print new files then delete these files:
on adding folder items to this_folder after receiving added_items
repeat with each_item in added_items
tell application "AddPrinter" to open each_item
delay 30
tell application "Finder" to delete each_item
tell application "AddPrinter"
quit
end tell
end repeat
end adding folder items to
After the last Mavericks update it has stopped working and gives the error message "the document m3.txt could not be opened. AddPrinter cannot open files in the text format"
The same happens for PDF files - it seems that AddPrinter app has been changed and this functionality no longer works.
Is there some way to restore the previous AddPrinter functionality (I tried copying and using an old verison of the app, without success)?
Or is there another app that will work as intended?

Answer 1

I have found an alternative to the AddPrinter.app that sort of works in this Macscripter tip from 2004:
http://macscripter.net/viewtopic.php?id=9835
do shell script "/usr/bin/lp '"
calls up the Unix print command (LP = line printer!)
This enables me to print .txt, rtf, pdf and jpg files
Here is the new script:
on adding folder items to this_folder after receiving these_items
    try
        tell application "Finder"
            repeat with i from 1 to number of items in these_items
                try
                    set this_item to item i of these_items
                    set the path_string to this_item as string
                    set the final_path to POSIX path of the path_string
                    do shell script "/usr/bin/lp '" & final_path & "'"
                on error error_message
                end try
                delay 30
                tell application "Finder" to delete this_item
            end repeat
        end tell
    on error error_message
    end try
end adding folder items to
Now I just need to find out how to do some minor formatting such as font size and margins...
Now digging into the CUPS manual:
http://www.cups.org/doc-1.1/sum.html