Heat and moisture, created by the printing process, dissipate through vents on the back of the product or through an internal fan. Moisture can sometimes appear on the trailing edge of the paper on small print jobs.
The amount of moisture is small, even though it is visible. When the paper is released from the product, small droplets of water are sometimes deposited on the trailing edge of the paper. In a few minutes, the moisture on the paper evaporates. After the moisture evaporates, the paper is not deformed in any way.
Paper can absorb moisture in high humidity environments. When paper that has absorbed moisture is heated very quickly, the warm, moist air from the paper leaves the product and encounters cooler air. This produces vapor.
HP has tested the performance of this product thoroughly, and this moisture is part of the normal operation of the product. The vapor occurs because moisture condenses in the output area until the internal temperature reaches a level at which no condensation occurs