JBL Nano Pro Subwoofer Spacer

Got this sub for a father's day gift and my Jeep has no ac with a rubber floor. The passive cooling was not working like it should allowing it to vent off heat laying on the floor. 

Printed this with four walls, 20% infill, & five top/bottom layers. 

I forgot to upload this model a when I made it and just put a sample photo up as I don't want to reprint it just to display the outcome of the print and waste material.