Finally got around to uploading the files for the Phobotic Centerpiece and Spectar IMU. Includes mounting standoffs in case and entry to buttons/IO/USB. Sorry about the poor photos, I've since progressed to billet Alu/Carbon for newer designs.
Snaps together with tabs. Prints without support. Your tolerances might be different to mine so good luck. I printed mine with PLA on a DIYed Prusa i3.
Solidworks parts provided for convenience.