Quote Originally Posted by Nr1madman View Post
The way to do this is to buy 45mm extrusion. Then you are 1mm out of perfect alignment but it will fit :)

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Well that makes a lot more sense, thanks! I still might go with the WBK bearings as I might be able to fit the ballscrew under 20mm rails without having to space them... not sure if its possible yet, it will be very tight.