# ZEBRA ZD421T
## Printer Setup
1. If you purchased the **Bluetooth or Wi-Fi module** for mobile printing, open the cap on the bottom of the printer and install the module.\
(Skip this step if you do not have a module.)
2. Pull the **yellow buttons** on both sides of the printer to open the cover.
3. Place the ribbon with the **outer side facing down** and attach it to the holder.
4. Install the attached **ribbon** into the printer.
5. Install the **ribbon core** into the printer.
6. After securing the ribbon with tape, lightly wind it to ensure it lays flat.
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7. Place the **label** **paper** between the media holders.
8. Close the printer cover and connect the **power** **cable**.
9. Press the power button and wait for the status LED to turn green. Then press the **FEED button** to check if the paper comes out properly.
***
## Connecting the Printer
{% tabs %}
{% tab title="Mobile" %}
#### **I. Device Setup**
{% hint style="warning" %}
**Note**: ZEBRA mobile printing is only supported on *Android* devices.
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Install [Zebra Print](https://play.google.com/store/apps/details?id=com.zebra.channelaps\&utm_source=na_Med) from the Google Play Store.
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Open the app and select the **navigation menu (☰)** and tap **`App Settings`**.
{% endstep %}
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Change the unit of measurement to **millimeters (mm)** and return to the previous screen.
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Tap the **`...`** button at the bottom and select **`Add Printer`**.\
Choose **`Bluetooth`** as the connection method.
{% endstep %}
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Tap **`Search Printers`** and select your printer.
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Enter the label size and tap **`Print Test Page`** to verify label output.
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{% endstepper %}
#### **II. Printing Labels**
{% hint style="success" %}
Once the **Zebra Print** app is set up, you can print labels from **BoxHero**.
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{% step %}
Create barcode labels on the BoxHero [web platform](http://app.boxhero.io/) (desktop), which can then be used on your mobile device.
{% hint style="info" %}
Learn more about designing barcode labels [here](https://www.boxhero.io/docs/key-features/print-barcode#create-barcode-labels).
{% endhint %}
{% endstep %}
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Open the [BoxHero app](https://docs-en.boxhero.io/getting-started#get-the-mobile-app) on your mobile device and tap **`Print Barcode`** on the home screen.
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Tap **`Select Label`** and choose your design.
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Select the items to print, enter the print quantity, and tap **`Done`**.
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Tap the **`Print`** button and select **`Print`** again in the pop-up.\
(If the printer is not listed, tap “**More / More Options**.”)
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Choose your printer and tap the **print** **icon** on the next screen to confirm printing.
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{% endstepper %}
{% endtab %}
{% tab title="Desktop" %}
#### **I. Installing the Driver**
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{% step %}
Search for your printer model on the official [ZEBRA website](https://www.zebra.com/us/en/support-downloads.html) and download the driver.
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Run the driver file to begin installation.
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On the final screen, check **Run the printer installation wizard** and click **`Finish.`**
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Pause the process and prepare a USB cable to connect your PC and printer.\
(Don't connect it yet.)
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Continue with the printer installation wizard.
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When prompted, connect the USB cable to both the printer and computer. If the screen doesn't advance, try disconnecting and reconnecting the USB cable.
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Click **`Next`** to complete the installation.
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Now you need to set the paper size in the printer settings. Go to **`Bluetooth & devices`** > **`Printers & scanners`**.
{% hint style="danger" %}
If the paper size is not set correctly in the printer settings, the printout may not align properly.
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{% endstep %}
{% endstepper %}
#### **II. Printing Labels**
{% hint style="success" %}
Once the driver is installed and paper size is set, you can print labels from BoxHero.
{% endhint %}
{% stepper %}
{% step %}
Log into BoxHero on your PC and navigate to the **`Print Barcode`** section.\
Select **Thermal Label** and enter the paper size you'll be using.
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Choose your desired template: **Barcode** or **QR Code**.
{% hint style="info" %}
The preview screen on the right will display one of your registered items for reference.
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{% endstep %}
{% step %}
In the **Design Details** section at the bottom of the page, set up the item information you want to display on the label.
{% hint style="warning" %}
Need help with design settings? Click [here](https://docs-en.boxhero.io/features/print-barcode#customize-your-barcode-design) for detailed instructions.
{% endhint %}
{% endstep %}
{% step %}
Select "**Vector**” for barcode format and click **`Save`**.
{% endstep %}
{% step %}
Add the items you want to print to the list, then click the **`Print`** button at the bottom.
{% endstep %}
{% step %}
Select the printer you want to use and click **`Print`** to start the printing.
{% endstep %}
{% endstepper %}
{% endtab %}
{% endtabs %}
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