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So, you could cut down the 508 to get 430mm. However, call Zen Toolworks and see what other sizes they might have. And also determine if you want their large and bulky leadscrew nuts or not. I order them from them without those nuts and thus pay less than the prices linked to above. Their bulky leadscrew nuts are zero-backlash but, with the pre-load of a build plate, you don't need that anyway. And did I mention that they are big and bulky?