anet a8 y belt tensioner (revised for wooden anet a8)

This is one part, revised to fit the wooden board Anet A8 (or one of its clones) to have a working Y tensioner :-) The width is 18mm (check it!!!!), everything else has been left as it is.

General warning: You have a grid and I hope you're having a ruler. I've been printing this part, too and had to figure that it won't fit my Woody-A8. Lesson learned :-)

Greets fly out to CH35C0