If you want to see another homemade CNC machine converted to 3d printer go and see Jon's project
He still controls this cnc 3d printer with Mach3 software. Since it has heavy aluminum gantry and was designed for routing, it is lot slower when 3d printing.
Here is his machine in action printing a whistle:
This is Jon's home made CNC router before conversion:
And here is the 3d print head attachment after it:
To learn more about Mach3 used for 3d printing and cnc to 3d printer conversions start here: