Replacement Tabs
thingiverse
I've taken this case and added an extra part from http://www.thingiverse.com/thing:1384316 for a quick fix. The tabs on this case are prone to breaking off, but this addition saves me from having to reprint the entire back cover if they do. To install it, I just slide the rails onto the sides of the back cover where the tabs were, and that's it. This will introduce a slight gap, but it's better than not having a back at all. Next up, I plan on modifying the design by adding a groove to the support legs so they can hold the back cover in place.
With this file you will be able to print Replacement Tabs with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Replacement Tabs.