Silver steel is not hardened and has poorer tolerance on ground diameter. Manufacturers don't recommend it for use with linear bearings. It will probably work fine with 3D printers because the loads are light and other things will probably crap out before your shafting. Just expect to see grooves appear over time as the balls in the linear bearings bed into the surface. With bushings rather than ball linear bearings, your silver steel will last longer. I prefer hardened shafts.