Hi all,

I am planning on making a new Z axis for my CNC. Ideally, I would like it to be capable of light aluminium milling. I am debating between getting SBR16 or MGN12 rails. Browsing online, both options are comparable in price. I'm thinking that the SBR16 rails should be the stiffer option due to the larger second moment of area however I have read that bearing blocks display some flex which ends up negating any benefits of the stiffer rail. Which rail would be better suited for my application?

Any help would be greatly appreciated. Thanks.

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