A printable letter opener where you insert a piece of a 10 mm snap-off blade during the print.At my office I open lots of letters, so I came up with this letter opener which uses a really sharp and durable blade from a 10 mm snap-off blade knife. The opener is designed to cut in a movement towards the body. If you want to make it possible to exchange the blade, it is possible to fold a few layers of tape and place it sticking out from the blade compartment. When the print is finished, pull out the tape and insert a blade. I haven't tried this myself, so if it doesn't work, remix!