Hi, on Tronxy X5S the belts not works fine. You can see the problem and the my solution in this video. It is subtitles in english 

In this other video my review of this printer 

INSTRUCTIONS

For Y carts you can prints this:

 2 of A1-spessore-cuscinetto-cinghie-carrelli-8e4mm.stl 

8 of A2-spessore-ruote-carrelli-7e6mm.stl

For X carts you can prints this: 

3 of B1-spessore-ruote-ext-6mm.stl 

1 of B2-staffa-cart-estrusore-V2.stl

This is if you want move the ballbearing towers to aluminium bar: C-spessore-torri-cuscinetto-20x8e4.stl

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