> ## 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.

# Filament holder install

> Mount the I-shaped spool holder on the back of the printer using the two black screws.

## Installing the filament spool holder

Now we install the **spool holder** - the I-shaped metal bracket that holds your filament on the back of the printer. It mounts with the **two black screws** from the accessory bag and the **smallest Allen wrench**.

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<Info>
  Grab the **I-shaped bracket**, the **two black screws**, and the **smallest** of your three Allen wrenches for this step.
</Info>

## Why it goes on the back

The filament needs a clean path up into the PTFE tube. Mounting the spool on the **back** lets filament feed upward into the tube, then down into the extruder. The bracket's small **clasp** keeps a heavy spool from falling off.

## Step-by-step

<Steps>
  <Step title="Turn the printer around">
    Rotate the printer so you are looking at the **back**. The spool holder mounts here, above where the filament feeds up into the tube.
  </Step>

  <Step title="Find the mounting holes">
    Look for a sticker with **two yellow arrows** marking the two screw holes. This is where the bracket attaches.
  </Step>

  <Step title="Position the bracket (clasp toward the back)">
    Hold the I-shaped bracket over the two holes with the **clasp facing the back**. The clasp is what keeps the spool from sliding off.
  </Step>

  <Step title="Thread the first screw by hand">
    Start one black screw with your fingers to get it lined up - this is easier than starting with a tool. Then use the **smallest Allen wrench** to turn it in (righty-tighty), just a little at a time.
  </Step>

  <Step title="Thread and tighten the second screw">
    Line up and thread the second screw the same way. Alternate between both screws, tightening a bit at a time so the bracket seats evenly.
  </Step>

  <Step title="Tighten firmly">
    Make both screws nice and tight. A full spool of filament is heavy, so a secure bracket matters. Give it a gentle wiggle to confirm it is solid.
  </Step>
</Steps>

<Tip>
  Threading screws by hand first prevents cross-threading and makes the tight back-of-printer angle much easier to work with.
</Tip>

<Check>
  The I-shaped spool holder is mounted firmly on the back of the printer with both black screws, clasp facing the back, and it does not wobble.
</Check>

## Up next

Almost there. The last assembly step is connecting the **power supply** cable, and then your printer is fully built and ready to power on.