Please note that I am still trying to improve that "thing", but it already works good for me
A belt tensioner for Tronxy X5S useable with the existing carriage.
This one is desined for the RIGHT carriage (the upper belt in my case) !!
I already work on a second part for the upper belt on the left side.
Just what you need is a 22mm bearing.
all other parts are printable.
You can use the Screws of the carriage to fix the tensioner.