3d printed carbon at nm scale to produce cpu and gpu

if carbon materials could be used to produce electronics, 

at a small scale enough to produce transistors for cpu and gpu, 

then that could become cost competitive since carbon could be 3d printed 

if carbon could be 3d printed at below 2 nm scale, then it could be competitive against silicon based cpu and gpu 

advantages of carbon materials such as graphenes and possibly carbon nanotubes is that there is less waste heat during intense work 

which would enable faster cpu and gpu without dealing with overheating 

according to media, graphene is a viable material in electonics 

and according to media, carbon nanotubes could become a future material in electronics