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Re: How many Db15 pins for hot end?

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The limiting factor may not be the pins. In the case of a Mendel90 for instance, the design calls for a ribbon cable. A 28ga ribbon cable is only rated at 1.4 amps per conductor. A 40 watt cartridge heater will need 3.3 amps @ 12 volts so 3 wires would be pushing it with little room for safety.

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