Y-Belt Tensioner for Anet A6 Evolution Cube

This is some small improvements for the y-belt tensioner of the Anet A6 Evolution cube type printer https://www.thingiverse.com/thing:2067818:

Guidance to avoid torsion of the belt
Enlarged body for using 15mm washers (DIN 9021)

The other part (y-belt-tensioner-2) is unchanged.

Installation:

1x M5x40mm hex-head screw (or 45mm) + M5 nut
4x M5x10mm + washers