If you can isolate where the noise is coming from it will help. There are only a few things to check.
The coupler between the X motor and the drive shaft may be loose on the motor shaft. When moving the spindle left the drive shaft/coupler will pull right, and leave the couple clear of interference. When moving the spindle right, the drive shaft/coupler will pull left and may cause the coupler to grind against the motor. There are also stop collars on the ends of the drive shaft which may be loose, permitting the shaft to move a little and lead to the grinding you only hear in one jogging direction.
Make sure those collars are snug against the inside vertical gantry post faces. Make sure the coupler is tight on both the motor shaft side and the drive shaft side.
I hope this helps.
4D
The coupler between the X motor and the drive shaft may be loose on the motor shaft. When moving the spindle left the drive shaft/coupler will pull right, and leave the couple clear of interference. When moving the spindle right, the drive shaft/coupler will pull left and may cause the coupler to grind against the motor. There are also stop collars on the ends of the drive shaft which may be loose, permitting the shaft to move a little and lead to the grinding you only hear in one jogging direction.
Make sure those collars are snug against the inside vertical gantry post faces. Make sure the coupler is tight on both the motor shaft side and the drive shaft side.
I hope this helps.
4D