you empty the developer by the entry toner (you don't need tool).Vous fill a bag in 30 seconds (if you prefer plastic bottle,no problem).You have developper for Cf3102,C350 and 351 (same developper).
When you have white lines ,you add developper (not a big quantity ) and you don't change IU (for long time)
When you have white lines ,you add developper (not a big quantity ) and you don't change IU (for long time)
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