DTG printers use aqueous textile inks (water-based chemistry) that require a unique curing process. Since D2 inks are water-based, they work best for printing on natural fibers such as cotton, bamboo, hemp, and linen. In addition, pre-treatment is typically applied to the garment before printing. The pre-treatment is heat-pressed into the custom t-shirt causing the fibers of the shirt to lay down. The pre-treatment also allows the water-based inks to bond more fully to the garment. This is especially important when using white ink on dark garments.

Once the custom garment -for instance a t-shirt- has been properly pre-treated, the shirt (or garment) is then positioned onto a platten system designed to hold the shirt in place. The shirt is then digitally printed according to the design in the printer queue.

There is no minimum requirements on Direct to Garment printing 

All files must be at least 300 ppi or Vector Format for screen printing. If your file is not 300 ppi, you cannot just increase the resolution of the file. This is called "upsampling" and will result in a blurry image. If you are creating your file in Adobe Illustrator or another Vector-based software, just size your image to the size you want it to print.