Vertical X Idler with Belt Tensioner

This is a replacement for the TEVO Tarantula X Idler with integrated belt tensioner.
Y Version

There are 2 versions of Case and Lid files. For stock size pulleys that came with Tarantula, print the 'Stock Idler' files. Other version uses wider pulleys if desired.

Belt animation: http://gph.is/2peM8qw

*NOTE - one of the idler pulleys shares an axle with a V-Wheel. Use a 50mm M4 screw here.

UPDATE 1: Adding versions with 8mm extra belt clearance for linear rails such as MGN12.