I use T2.5x6mm Synchroflex timing belts to transfer power from stepper to lead screw.X and Y axes have two motors to rotate the screws. And yesterday the belt snapped, not for the first time I gotta say. So now I'm planning to replace two 2.5mm pitch belts with one 5mm pitch on Y axis but still leaving two motors to steer two lead screws. Of course I'll need to replace timing pulleys and make some tensioners. Stuff ordered,hope it will work.
Click image for larger version.  Name: a_1.JPG  Views: 917  Size: 394.9 KB  ID: 3746Click image for larger version.  Name: a_2.JPG  Views: 988  Size: 414.5 KB  ID: 3747Click image for larger version.  Name: a_4.JPG  Views: 966  Size: 420.6 KB  ID: 3748Click image for larger version.  Name: a_3.JPG  Views: 1002  Size: 386.7 KB  ID: 3749