Quote Originally Posted by A_Camera View Post
Will you be upgrading only the X? Also, don't forget to buy machined ball screws AND also support bearings and ball nut bracket, unless you plan on making those. Another thing is that I don't think you should buy 1605 in that length, go for at least 2005.
If this is a router then wouldn't use 2005, it will be far too slow. Router needs at least 10mm pitch and at this length I'd be inclined to use 20mm pitch with 2:1 ratio to lower screw speed and increase torque.

Should get 2020 screw with end bearings and machined for about £200.