Mendel Power Bracket
This OpenSCAD script is a derivative of the XLR Bracket model that can create either a standard XLR bracket or a coax DC power bracket slot. This way you can use a commonly available 12v 5a power brick instead of splicing an XLR connector onto your power source.
Change plug_diameter=8 and type="COAX" in order to mount a 2.5MM DC Power Connector.
Change plug_diameter=20 and type="XLR" to generate a standard XLR bracket.
Or just download the appropriate stl file if the diameter is right for your sockets.
Requires the mendel.inc and mendel.conf from the Parameterized Mendel project.