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There were some length variant openbuilds rails that went out, I had two that were less than 500mm and two that were over. Before I was just assuming they were all the same length. For a true 500mm long rail, removing 61.8mm seems to be an ideal fit while still allowing for expansion. The one I measured 64 on were likely over 500mm. Which is annoying, The leadscrew spacing seems to be consistant on both machiens I have here.