Exposed for a long time in the air. After taking out the ink roller from the blister, you should use it at once and close the printer cover when printer is working.
The sound is made by the gear wheels when running, which is normal and not affecting printing.
If the tube belt seat is not removed the cover, take out the tube belt seat and turn the belt several times until it is normal.
When changing the inked nylon, the spring is assembled in a wrong way. Should reassemble the spring by opening the cartridge.
