AcrobatUsers.com q291099

// Loop through all of the fields in the document
for (var i = 0; i < numFields; i++) {

    // Get a reference to the current field
    var f = getField(getNthFieldName(i));

    // If the field exists, isn't a button, is set to read-only, and is set to not print...
    if (f && f.type !== "button" && f.readonly && f.display === display.noPrint) {
        f.display = display.visible;  // ...make it visible so it will print, gosh darn it!
    }

}