BQ Prusa i3 Hephestos X-Carriage Zip-tie free (belt)

This is a modified version of the original X-Carriage for the Prusa i3 Hephestos by BQ. I replaced the zip-tie based belt mount with a nut mount. I also thinned down the middle part to get the belt in the proper position.

for the belt mount itself i used the mount from http://www.thingiverse.com/thing:704855