In case you did not print that yet. I added some rounding to the sides & also put my X-axis belt clamp in the zip file. The belt clamp matches the contour of the outside of the x-carriage. I also added a version with ears on the corners to keep it from lifting off the print bed if you have that problem. The link for the download is: http://www.zewind.com/X-CarriageModified_rev20.zip
Here is a screen capture of the design showing the change.
X-Carriage_rev20.jpg