Dual Auto Leveling Prusa i3 Reworked X-Idler Tensioner with T8 Leadscrew

These parts are drop-in replacements for the Prusa i3 Reworked X-axis assembly and is meant to be used with the Herringbone Prusa i3 Reworked Greg's Extruder (http://www.thingiverse.com/thing:1446842) The following changes were made to the original parts:

X-IDLER

1) A belt tensioner was added that can be used with either a 4x40mm bolt or a 5x40mm bolt. A nested nut trap is used to catch the smaller 4mm nut.The tensioner has an effective range of 11mm. An access port has been added to the s