![Image](https://www.thunderlaser.com/wp-content/uploads/2018/11/08.jpg)
This problem is due to the different movement of the belt on both sides of the Y-axis, which lead the belt is not synchronized.
1. The coupling loose
2. The gear of transmission shaft loose
- 1. The coupling loose;
![Image](https://www.thunderlaser.com/wp-content/uploads/2016/05/b1.jpg)
If yes, please tighten it in clockwise with M5 Allen wrench.
- 2. The gear of transmission shaft loose
![Image](https://www.thunderlaser.com/wp-content/uploads/2016/05/b2.jpg)
If yes, please tighten it in clockwise with M5 Allen wrench.
there are another ways to improve the cutting problem by adjusting software.
- 1. Reduce the User setting of Go Acc factor and Speed factor to minimize the impact Like below:
![Image](https://www.thunderlaser.com/wp-content/uploads/2018/11/10.jpg)
If nothing,please follow next step to tick the option of "Backlash reapy optim"
- 2. An option of software for optimizing that problem.
![Image](https://www.thunderlaser.com/wp-content/uploads/2018/11/09.jpg)
Then re-download the file to laser machine and test again.
--I am not a technician,just a porter of knowledge.
![特开心 :D](./images/smilies/icon_e_biggrin.gif)