Prusa i3 – Build Manual
8.1 Heated Bed Connecting
Strip the ends of the heated bed positive and negative wires and connect to the D8 +/- on the RAMPS (at the
bottom directly left of the power connector). Also connect the Heated Bed thermistor cable to the middle two
thermistor pins on the vertical column of six pins to the left of the Z-Axis motor headers (it doesn't matter about
+/- for thermistor pins). See Fig 8.1a for a picture of the pins. The Heated bed wiring should be firmly cable
tied whilst allowing full backwards/forwards movement of the build plate.
8.2 Build Plate Fans Connecting
Connect the positive and negative wires for the pair of build plate fans to the D9 +/- on the RAMPS (to the left
of where you connected the heated bed power)
8.3 Hot-End Connecting
Connect the two red hot-end power cables and wire into D10 on the RAMPS (+/- doesn't matter). Also take the
thermistor cable with the two pin DUPONT connector and plug onto the two pins underneath the heated bed
thermistor as described above. You may want split the hot-end cables about 1/3 distance from the hot-end and
wire in connectors (e.g. spade connectors for the heater wires and 2 pin dupont for the thermistor), this will
make maintenance of your hot-end a lot easier being able to quickly unplug and remove it.
The Factory supplied MK8 Motor connector cable 'usually' connects to the RAMPS black wire up .. however
there is no recognised standard when it comes to stepper motor wire cables, but if your cable turns out to be
connected backwards it will just turn the motor backwards so easy to spot and correct during setup.
Version: 1.3 Page: 41
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