1) Get Write.scad and some fonts from http://www.thingiverse.com/thing:16193, put it in the same folder
2) Create a logo as a DXF of 50mm x 50mm, or use one of the supplied logos.
3) Load bottle-clip.scad into OpenSCAD. At the bottom, there is an example for 4 name tags. Change the desired options (name, logo, etc.) to your needs.
4) Render, export to STL and print it.
(Instructions copied from http://www.thingiverse.com/rohieb/about)Backspace Name Tag by Backspace is licensed under the Creative Commons - Attribution - Share Alike license.