pueden decirme cual es la diferencia entre las tintas; CAL-ECOCART-ROLAND 440 (440 ml. con $ 44.99 ) y la CAL-ECO-001 ( 1000 ML. CON $ 29.90 ) esta es mas del doble en cantidad de tinta i a un bajo precio respecto a la anterior? . Que me aconsejan? tengo una Roland RS 640 con sistema continuo.

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