Oh and in case someone wants to experiment with CF rods as well please be aware that you cannot use normal bearings on these other than for short tests. Well you can but it's not a good idea.
Normal steel bearings (Qidi stock or Misumi for example) have steel balls inside them that "roll" on the rod as the carriage is moving, these balls are much harder than the CF and it will likely take damage over time. You should use polymer bearings/bushings.