some tips to get crisp printouts from your mini thermal printer
- The Phomemo D30 (and others like the Niimbot D110) use the same print head with 12mm width and 203 DPI resolution. This is actually 8 dots per mm. So you can print a height of 96 pixels. If you print on a 15x30mm label your printable size is 12x27mm. So you need to create a bitmap with a dimension of 96×216 pixels.
- Use your favorite photo editing software (Photoshop, GIMP, Affinity etc.) to create a template in this pixel dimension. Choose 1-bit color (black and white) if that is a option.
- For best results use a nice pixel font (most of them have to be used at exactly 8px) or a font with good pixel hinting and deactivate anti aliasing in the preview of your design software. Make sure to place all design elements on integer coordinates.
- Export a 2 color (black and white) PNG file in the exact size and copy it onto your phone. I use Signal’s “Note to Self” function for that, and then move the PNG with totalcmd to the download-folder from where it can be accessed by Print Master.
- Insert the picture in Print Master creative mode and align it with the upper-left corner. Resize the picture to fill the entire available space on your label.
- Test print to check it everything comes out crisp, if not verify for template.
- In the confirmation step before printing, you can define a offset position, in case you print is not centered correctly.