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For 30T or even 40T pulley X1, X2, Y1, Y2, Carriage and Frog would have to be changed. I'm sorry, I left no room for such upgrade because I was trying to make everything in line and compact.

By end of August I will get 28BYJ-48 motors with 1/16 reduction gear instead of 1/64. I am going to test them and I will let you know about the result. That may solve the problem with speed and it is going to be much easier than changing so many parts.