> ## 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.

# End caps

> Snap the plastic profile covers onto the top rail ends to cover sharp aluminum edges.

## Cover the sharp edges

The top rail has exposed aluminum ends that can cut you. The two plastic **profile covers** snap over them for safety. Quick and important.

<iframe src="https://iframe.mediadelivery.net/embed/697805/a148779d-0ad8-4389-a0fc-6ba2c19c0e7b?autoplay=false&preload=false" style={{ width: "100%", aspectRatio: "16/9", border: "none" }} allow="encrypted-media; picture-in-picture" allowFullScreen />

<Info>
  Find the small bag with **two plastic clips** labeled "profile cover." No tools needed.
</Info>

## Step-by-step

<Steps>
  <Step title="Identify the caps">
    Each cap has a **smooth side** and a side with **small pegs**. The pegs go into the aluminum rail slots.
  </Step>

  <Step title="Press them on">
    Line the pegged side up with the exposed aluminum at each end of the top rail and press firmly until it seats. It takes a little force.
  </Step>
</Steps>

<Check>
  Both end caps are pressed firmly onto the top rail ends, and no sharp aluminum is exposed - safe to touch.
</Check>

## Up next

Next you install the **filament spool holder** on the top rail.