The Bixolon SLP-DX420 prints on direct thermal labels, which have ink already embedded within the paper. The ink is exposed when it comes into contact with the heat of the print head, which means there is no need for a ribbon. Since it does not require the extra space to hold a ribbon roll, the overall size of the SLP-DX420 is slightly smaller than its thermal transfer counterpart.
This Bixolon printer supports both direct thermal 1-inch core rolls or fanfold labels.
In order to use fanfold labels, users must first detach the rear paper supply cover on the back side of the printer. This can be done carefully with a knife or sharp cutting instrument. The paper holders can then be adjusted to the paper width by using the Fix Tool. This is located on the one side of the paper holders and can be pushed down when the correct paper width has been reached.
The SLP-DX420 prints on multiple sensor types, which include:
- Gap sensor
- Black mark
Gap sensor, black mark, and continuous are commonly compatible with most thermal printers. Labels with a notch have a small hole punch in the liner between each label. A sensor on the upper cover of the printer operates as a gap sensor while a sensor for black mark and notch media types is located on the bottom portion of the printer.
The printer will automatically calibrate for most media types with a media width of up to 110mm. However, a manual calibration is required for special types of media where the sensor cannot calibrate automatically.