Accessories - what do they do?

I am new to the CNC game. Never owned one never played on one. After some research I believe when I do (hopefully soon) I will go with the Onefinity. That being said because I am new, I am not familiar with all the accessories and what all they do. I can figure out some of them by reading the title but the others I dont have any idea on. My biggest question is the 3rd rail that I see being added. What is the purpose of this rail?

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Right now the 3rd rail is not an option to purchase, it is standard on all machines. It stiffens the gantry from flexing.

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The 3rd rail (stiffy) has been and currently is free with every purchase. It will stop being free and become an add on at some point in the future. It adds extra rigidity for large heavy spindles.

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Ooo like 80mm 220v spindles :wink: (patiently waiting of course as the macheetah is sufficient to learn on)

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