Just a Remix of the Tensioners designed for my Cr-10, as requested by the user TallDonkey on the original Y Axis Tensioner page.
I didn't try to print and use this tensioner personally due to the fact I don't have an Ender 3, so... comments or photos are welcome.
For this version you will need to re-use the original bearings of the Y axis, one button head screw M4x20 mm, and an adapter between the screw and the bearings.
The adapter file is with the nominal dimensions, Need to be scaled according your fitting needs.
Update of 15/10/2018
Added Body File Version 2, with 2mm offset to align the belt to the frame.
Hope you enjoy it