I used the Balls from Tinker Bills Link..because my Delta was a anycubic pulley in his first life so 200mm was enough. later i bought rods to make 310mm rods. Amazon and ebay makes it so easy 😉
If the Duet is quite old, then the most likely cause of the problem is that the PHY chip isn't adequately soldered to the PCB. When this happens, using hot air rework equipment to reflow it sometimes fixes the problem. Otherwise the PHY chip needs to be replaced.
