Check and adjust the tension of the synchronous belt and pulleys.

Explanation:

If you have reduced the speed but the misalignment issue still persists, it is possible that your 3D printer has mechanical or electronic problems. Most 3D printers use synchronous belts for motor transmission to control the position of the nozzle. Synchronous belts are typically made of rubber with added fibers for reinforcement. Over time, the synchronous belt may become loose, affecting the tension of the belt and its positioning on the pulleys. If the tension is insufficient, the synchronous belt may slip on the pulleys, causing them to rotate without the belt moving. On the other hand, if the belt was originally installed too tightly, it can also lead to problems. Overly tight belts can create excessive friction between bearings, hindering motor rotation. Ideally, the belt should be tight enough to prevent slipping but not too tight to impede the system's operation. If you are dealing with misalignment issues, you need to ensure that all synchronous belts have appropriate tension, neither too loose nor too tight. If you suspect any issues, you can adjust the tension of the belt by adjusting the passive pulley. (Refer to the following steps for more details.)

Steps:

1. Check if the pulleys on the motor are securely fastened. The pulleys are fixed to the motor shaft by two setscrews. If the pulley setscrews are loose, it can cause motor backlash, resulting in missed steps and misaligned prints. The solution is simple: tighten the setscrews on all four corners of the pulleys, and then print a simple model to verify the fix.

2. Check if the loose pulleys create friction with the motor. If they do, loosen the pulleys and adjust their position to have a 1mm gap between the pulley and the motor. (Check both X and Y axes; Y-axis refers to the direction of the heated bed movement, and X-axis refers to the direction of the nozzle movement.)

3. Check if the motor becomes excessively hot, reaching temperatures above 60°C. If it does, please contact customer support to measure the corresponding axis drive voltage and check if it is within the normal range.

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