These pages contain various information related to the Behringer XR18 digital mixer...
Included an STL file below for 3D printing a set of XR18 rackmount adaptors. This design recesses the XR18 by 2 inches. A print in-fill of 60% is recommended using filament like PLA+ (or stronger). Don't over tighten the bolts when mounting the adaptors and use washers to distribute bolt pressure and avoid cracking the plastic.