Nice Idea! Could be very Handy.
Didn't work for me that well though.
Printed Using Velleman K8400 and PLA. Needed Brim because it warped on first try.
Still the gap was too small, could not get any Paper in it.
My Printer is probably just too much diy for printing that correctly.
I'm gonna try http://www.thingiverse.com/thing:106568 now.