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Belts and driving wheels are very important for accurate and consistent X/Y movement.
Please check if all screws are tight.
1. 4 belts total on X/Y axis.
2. 8 belt wheels total on X/Y axis. Each is fixed by 2 grub screws.
3. 8 limiting coloums total on X/Y axis. Each is fixed by 2 grub screws.
4. X axis belt block has 4 fixing screws.
5. Y axis belt block has 4 fixing screws.