The design of the Antec One is matching the rest of the products from Antec's gaming series, with the case posing as a mini version of the three/eleven hundred gaming case. The Antec One is an all-black case with a passive-aggressive design consisting of simple geometric shapes with sharp edges. The One is tipping the scales at less than 5kg, making it one of the most lightweight steel cases ever made.
The faceplate of the Antec one is almost entirely covered by perforated 5.25" covers, much like the premium gaming cases of the firm; however, no all of them correspond to actual 5.25" bays. Only the top three bays are usable, the rest exist only to enhance airflow and for aesthetic reasons.
We found the front I/O ports and power buttons integrated towards the top of the faceplate's front side. Typical round momentary switches at being used for the Power On (right) and reset (left) buttons. Interestingly enough, the two USB ports are USB 3.0 ports, something extremely rare for a product of this class. Antec provides an adapter to connect these two ports on an USB 2.0 header, if necessary.
Much like the rest of the case, the rear of the Antec One is entirely black. There are two holes for watercooling hoses covered by rubber grommets but not any other noteworthy features; even the expansion slot covers are not reusable.
One 120mm fan opening can be found at the embossed top panel of the case, right above the CPU area. Antec embossed the panel in order to prevent the fan from blocking the installation of a full size ATX motherboard, therefore installing even a single watercooling radiator feels impossible.
The side panels of the Antec One are embossed, both for aesthetic purposes and for the side panel fan to clear any components. A slot for a single 120mm fan is available on the left side panel but the One comes with no fan pre-installed from the factory floor.
At the bottom of the case Antec placed a washable dust filter beneath the PSU intake vent. The filter is removable from the back side of the case. There is also an unoccupied slot for an extra 120mm/140mm intake fan. It is worthwhile to mention that the feet of the case are quite tall, which gives the Antec One plenty of breathing room from below.