> ## Documentation Index
> Fetch the complete documentation index at: https://stem-docs.intellectualpoint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Wiring and PTFE tube

> Set the voltage switch, connect every cable to the right port, and install the PTFE feed tube.

## Wiring it all up

The mechanical build is done - now you bring it to life with wiring. You will set the voltage switch, connect the power and signal cables to their labeled ports, and fit the white PTFE tube that guides filament to the extruder.

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<Warning>
  **Set the voltage switch first.** On the back of the power supply is a small red switch reading **115** or **230**. In North America it must read **115**. Use a screwdriver to slide it. Setting this wrong can prevent the printer from working (or damage it).
</Warning>

## Connect the cables

Each cable is labeled and only fits its matching port one way. Pull the bed forward to reach the wiring area in the back.

<Steps>
  <Step title="Power cable (bed to PSU)" icon="plug">
    Connect the red/black/yellow cable from the bottom of the power supply to the matching red/black/yellow connector under the printer bed. It clicks together one way only.
  </Step>

  <Step title="Z cable to the Z-axis motor" icon="cog">
    The short cable labeled **Z** plugs into the back of the Z-axis motor.
  </Step>

  <Step title="Z cable to the limit switch" icon="octagon-minus">
    The other **Z**-labeled cable plugs up into the bottom of the Z-axis limit switch on the front.
  </Step>

  <Step title="X, X, and E cables to the extruder" icon="component">
    The braided cable has three white connectors. The longest (smallest connector, labeled **X**) goes into the front of the QR-code housing; the second **X** goes into the back of the housing; and **E** plugs into the side of the filament feeder.
  </Step>
</Steps>

## Install the PTFE tube

<Steps>
  <Step title="Fit the pneumatic coupler">
    Screw the gold pneumatic fitting (from the "spare parts" bag) into the threaded hole on the side of the filament feeder, righty-tighty.
  </Step>

  <Step title="Insert the white tube">
    Push the white **PTFE tube** firmly into the coupler until it clicks. This tube guides filament into the extruder.
  </Step>
</Steps>

<Check>
  The voltage switch reads **115** (North America), all cables (power, Z motor, Z limit, two X, and E) are seated in their labeled ports, and the PTFE tube is clicked into the feeder coupler.
</Check>

## Up next

Almost there - a quick **print bed** setup and you are ready to power on.