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Whenever you install a new hotend, it's important to run a PID tune. This will allow your printer to adjust some internal parameters so that it can learn how your hotend heats up. This way, your printer can anticipate how much power it needs to give your hotend to get it up to temperature, but not over.

Use a computer to connect to your printer. If you have a typical RepRap printer, you can use PrintRun, Repetier Host, or MatterControl.

Other, closed-source, printers may be better suited to their manufacturer's recommended printer control software.