I've been using clone nozzles for about a year while fine-tuning my homemade 3D printer. You can get by with a lot of cloned hardware (heatsink, heater block, extruder), but I've come to the conclusion that nozzles (and thermal brakes) are critical to the real deal. Of course you can buy 10 nozzles for the price of an original e3d V6 nozzle, but do you really want to change it more than 10 times when you can buy a good nozzle and it will last twice as long? I do not think so.
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