This is refreshing my memory. Not sure if this is still applicable. At one point I bought a generic ink refill kit to refill my carts. Still showed no ink and would not print. I think the chip in the cart keeps track of the ink and kills it when it runs out.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT