I own several 3D printers including an Ender 3 Max. If you want uninterrupted printing you need one have additional hotend assembly on hand. Hot ends are when something goes wrong, not when it goes wrong. They all fail at some point. This device is one of the best designs with screws holding the heater block in place making changing the nozzle much easier and allowing for one handed operation. It contains a heater, a thermistor, a brass nozzle, 0.4mm, two hardened steel nozzles, both 0.4mm. Two silicone thermal block caps and a Teflon tube. It's a lot for the price. Overall this is a good set at a great price. Worth a full 5 stars!
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