R-CNC X-nut ACME lead screw

[18/10/2017] use this update instead of mine!
https://www.thingiverse.com/thing:2578176

[25/08/2017] Romaker will change the X axis for GT2 belt very soon (actually beta testing), this remix won't be useful anymore.

Around 13€ from China for this upgrade ( search 800mm lead screw in Aliexpress ).
I choose "lead 8mm" to be close to the speed of the Y axis.

Now I can move up to 10800mm/min (180mm/s) in both axis!! The X motor is not too hot anymore.

Print it, use your drill (and so