A device and a method for improving the quality of prints using a printing device and system for carrying out a print job with a digital printing machine, preferably with a printing machine that works with a toner, in particular with an electrophotographically operating printing machine, whereby the sheets (1) are preferably printed by recto-printing and verso-printing, whereby the sheets (1) to be printed are divided into batches, and whereby, in the case of batches that are incompletely occupied with sheets (1), the slots of the missing sheets are replaced by an approximately sheet-sized toner field (3) on the transport belt (4) for the sheets.