This is a power supply made from a dell OptiPlex 760 PSU. The PSU is not a standard ATX PSU and this design takes advantage of that. In the posted pictures, a picture of the PSU is attached. Some Banana jacks are also attached, not all sizes are compatible with the 3D model so make sure you get the right one. The buck boost converter is a WZ3506E model. The 3D design does not have holes for screws as they were meant to be drilled later according to space