As usual KM screwed A4 models. This time they went with their own design instead of borrowing from other manufacturers (also very problematic). You can squeeze 4e A3 series up to several times of parts life before they react dumping developer but at this point you are way ahead, here with C3350/4050i and so on imaging units and toners can fly out diabolically fast not to mention problems like this jamming on fairly new machines with low counter.
The only exception is bizhub 5020i series based on proven Brother model quite bulletproof, easy for customers and service.
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