There are several possible reasons for this:
• There are no labels inserted,
• the labels are not inserted correctly
• the labels are inserted but not left-justified,
• there is paper dust or a piece of a label blocking the sensor,
• the labels you are using do not have the index marks (oval perforations) properly cut out between each pair of labels,
• you are not using DYMO Authentic labels,
• the photo sensor that reads the index mark has failed.
• If the latter is the case, please contact DYMO Technical Support.

LabelWriter printers require specially treated thermal direct labels that are not compatible with any other printing technology. These thermal direct labels must be compatible with DYMO Printers and stored properly. We recommend that you use authentic DYMO LabelWriter brand labels to ensure compatibility and quality. Other brand labels may not work properly with your printer or may damage it and void your warranty. Please contact DYMO Consumer Service if you need help with selecting the right labels for your LabelWriter.

All printers from the LabelWriter 300, 400 and 450 series that are compatible with supported versions of Windows®/macOS®.

LabelWriter printers are designed to print 2 million inches of thermal labels, which equals more than 500,000 Standard Address labels. Please note that to keep your LabelWriter printer in a good condition, we recommend using only DYMO brand labels and regular maintenance of the printer.

The LabelWriter EL, 300, 400, and 450 series of printers all use a universal power supply. These LabelWriter printers will work worldwide. All you need is a small adapter that enables you to plug a USA-style plug into the type of power outlet used in the country you are in.

The LabelWriter 450 series printers are officially supported on the following platforms: Windows® 7 and higher (32 or 64-bit), macOS® 10.13 and higher. For the LabelWriter 300 and 400 series printers, please consult the compatibility chart on Here or contact DYMO Technical Support. For earlier versions of Windows®/macOS®, please contact DYMO Technical Support.

All printers from the LabelWriter 300, 400 and 450 series that are compatible with supported versions of Windows®/macOS®.

All LabelWriter 400 and 450 series printers are USB 2.0 compliant.

Pull apart the spool, the part of the spool with the spindle should be in your left hand. With your right hand, pick up the roll of labels and place it near the spool. Carefully slide the roll of labels on the spool, following the white arrow. Push the roll of labels firmly on the spool so that the notches on the base of the spool enter the cardboard core of the labels. There should be no gap between the base of the spool and the roll of labels. With your right hand pick up the other piece of the spool. Carefully slide it down the spindle. Ensure that the notches enter the cardboard core of the labels. The spool should be clamping down tightly on the roll of labels. Place the spool in the LabelWriter. Ensure the labels are justified left.

Yes, you can install multiple LabelWriter printers on the same computer. Both Windows and Macintosh OS support multiple installations of the LabelWriter.

Plug the Ethernet cable into the right side of the print server. Plug the other end of the Ethernet cable into an available Ethernet connection. Plug the USB cable from your LabelWriter printer into the right side of the print server. Make sure that the USB cable is connected to your printer and that your printer is plugged in. Plug the print server power adapter into the left side of the print server. Plug the other end of the power adapter into a power outlet.

The LabelWriter print server was specifically designed to work with LabelWriter 400, 450, and 4XL series of printers only. We do not recommend use with any other products.

Yes, you will need a 400 or 450 series LabelWriter label printer with its USB cable and power adapter, installed LabelWriter printer drivers (available for a free download on www.dymo.com), LabelWriter Print Server, a standard Ethernet cable, and a working Ethernet connection to your Local Area Network.

No. The LabelWriter Print Server can only translate between a single printer and the Ethernet network. USB Hubs and other non-printer devices are not supported.

UPS, DHL, and FedEx require labels that are 4" x 6" in size. The DYMO LabelWriter 4XL label printer provides an easy and cost effective way to print a wide range of professional-quality labels. Offering 300 dpi, fast print speeds, 4-inch wide labels, a sleek compact design, and its direct thermal technology eliminates the need for ink and toner.

DYMO does not support printing to LabelWriter printers on different gateways or subnets. The DYMO Print Server was designed to work in small office environments that use a single subnet.

Yes. Ensure you are running Mac OS 10.3 or higher if you plan on connecting multiple LabelWriter printers of the same model to one workstation.

Some LabelWriter printers manufactured after April 1, 2014 will not properly install on Windows® 7 PCs when attached to a USB 3.0 port. DYMO has developed an update that will fix this problem on these printers. Please click here to determine if you have an affected machine and install the fix.

Please visit our LabelWriter Wireless page for a video & PDF with step by step instructions.

To expose or retract the cutter blade: Press the button on the front of the tape (lower) compartment to open it. If a tape cartridge is loaded, remove it. Raise the cover on the label (upper) compartment. Hold down the form feed button. While pressing the form feed button, press down on the black back-feed button (to the right of the label path in the label compartment). This will cause the tape cutter blade to change from the hidden position to the exposed position. If you wish to clean the blade at this point, it is recommended that you do this with rubbing alcohol and a cotton swab.