My biolod premium cable have broken but no problem with use, so I want to solve the problem
Do you have electrical tape? You can wrap some around the exposed section (like you did twice already).
Or can you use a longer DXL cable? So that it can go a bit more freely above that space between the 2 AX-12s? That may help from getting the cable caught in that area and getting rubbed on that frame part.
커넥터에서 터미널을 빼고 수축튜브로 감싸는것도 좋은방법입니다.
가장 깔끔한건 동일한 길이의 케이블로 교체하는겁니다.
https://www.robotis.com/shop/item.php?it_id=903-0073-001