After some printing I noticed noise coming from the roller bearings installed on the X and Y axis of my Lerdge ix. I took everything apart and found that the tolerances between the bearing and the shaft are wrong and the bearing is making noise.
I replaced the bearings with a different model with 20 teeth and 5mm bore ball bearings ! I had to remix the X and Y axis tensioner mount to fit the new 18mm bearings. Original bearings were 16mm.
https://www.amazon.it/gp/product/B07K8G9LS5/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&th=1
The author remixed this model.