The CNC machine will, of course, need some hardware upgrades such as printhead as well to fully turn your CNC into a 3d printer, but this software upgrade will make your CNC hacking much easier.
Software add-on and instructions can be found here:
http://cnc2printer3d.wordpress.com/software/
Here is a much more detailed Instructables guide page made by Nuri:
http://www.instructables.com/id/CNC-to-3D-Printer-Conversion/
Here is a video by Donald Fournier showing how he uses a Hoss G0704 as a 3d printer:
Here is a video by Chris DePrisco that shows, in great detail, how he attached an extruder to his CNC mill. He also shows the test 3Dbency and other 3d printed upgrades.
Updates:
Here is another way to use Mach3 on CNC machine as 3d printer, and description of hardware needed. One could combine those two methods.
http://diy3dprinting.blogspot.com/2014/01/another-way-to-use-high-end-cnc-as-diy.html
or have a look at the extensive video showing a modification of CNC table plasma router to a 3d printer:
http://diy3dprinting.blogspot.com/2014/07/upgrading-old-cnc-plasma-router-table.html
Jon also converted his CNC into a 3d printer and uses Mach 3:
http://diy3dprinting.blogspot.com/2014/10/jons-homemade-cnc-router-converted-into.html
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Mach3 UI was always fascinating to me ... |