Battery Case for Lizone Universal 12000mAh Dual USB Port Power Bank

This is a case for the Lizone Universal 12000mAh Dual USB Port Power Bank with Aluminum Body - Silver that I purchased on Amazon. It is essentially a right rectangular prism that has a cavity inside to fit the battery. There is 0.030" space between the battery and the inside of the case. If I were to tweak the design, I would reduce the gap to 0.015".

http://a360.co/2pc6gtD to view and download design files.