X-Axis belt tensioner for geared GT2 pulley

The original design worked perfectly for some months now. Then I got my new 16 teeth GT2 pulleys, disassembled it and they wouldn't fit into the original tensioner.
I decided to keep most of the thin and just redesigned the body. Now, it's longer and the guiding hole is wider so you can use a cheap pulley by breaking away the side guide plates of the thing (take a look at the picture).
The improvement in print quality in the direction of the x axis is astonishing.
Have fun!

Text from th