Please note the following about selecting a hot end:
The standard hot end on Printrbots is rated at 12 volts 30 watts. If you are using a brick type power supply that came with your Printrbot, this is the wattage you need to stay with. If you have an upgraded power supply, such as an ATX computer power supply then you can upgrade your hot end to a higher wattage, high flow with higher wattage, or high temperature selection generally without power concerns. Attempting to run a higher than 30 watt heater core on the original brick power supply can and most likely will greatly shorten the power supply's life. Also please note that when upgrading to the high flow or high temperature hot ends that DIY adjustments or modifications may be needed to accommodate the extra length, bed level sensor height and fan cooling requirements. The standard temperature sensor that shipped with Printrbots was a EPCOS NTC thermistor G560 / 100K / 1%. Selection '1' for the thermistor table in the Printrboard firmware. For the standard temperature sensor we continue to use the same rated part, both in terms of electrical and mechanical specifications. Other temperature sensors are available for better accuracy at higher temperatures, but you will need to update your firmware to match what you are selecting if not the original standard EPCOS. You should be confident to do this or have a friend that can before purchasing the alternative temperature sensors. For more information on temperature sensors see our temperature sensor page.
All hot ends require fan cooling and is not included with the hot end. Fan mounting can be 3D printer model specific. We encourage you to search sites such as thingiverse.com for suitable solutions for your 3D printer that you can print yourself.