This is a parametrized horizontal motor base. It was designed to hold the motor for a "Motorised siren brushless 450" (http://www.thingiverse.com/thing:59580).
It can nevertheless be used for other purposes. Within the SCAD file, specify the motor diameter, the motor length, the base width, the desired shaft height from the bottom of the base and the tie wrap size. Render the STL file and print it!