After reading more here about other people's builds I think the motors are too weak, especially for Z.
X,Y and Z are 57BYGH728, which have a rated holding torque of 18Kg.cm (1.77 N.m, 250 oz.in) and I think this is just not enough to move the head effectively, hence I had to gear it down. Only getting 500mm/min X and Y, 200mm/min Z
I have a 60BYGH301 which I am planning to use for my 4th, rated at 32 Kg.cm (3.1 N.m, 439 oz.in).
Do you guys think the 60's would be significantly better, enough to warrant buying 3 to replace the 57's?