Three blocks of wood—presumably mahogany—a couple brass rods and a few scraps of copper ultimately determined the shape of the device.
The tiny ink brayer, made with "some parts of an old radio cassette player [he] found in the studio," is a nice touch.
Video after the jump...
Still, Bertran notes that his little letterpress falls short in terms of accuracy: "I must say this is not the most precise letterpress ever. This type of wood is really hard and thin drills were bending. Also I couldn't work with a precise router this time (I used a Dremel with the router table)."