Spigen back plate for iphone 5 slim armour

here we have a back plate for the Spigen slim armour for iphone 5(S)
Gurtrude the i3 is only 3 weeks old so i'm still trying to get a handle on what she can do. i thought it was about time to start get a bit more ambitious which is how i came up with this thing.
I have modelled it in inventor (which are the .ipt files) and have attached both a plain cover (spigen case) if you want to do your own thang, as well as the swanky looking one (spigen case assembly)
the cool looking one took 3 hours to print for me. partly due to the fact i set it to print vertically so each layer wraps around the phone, otherwise the lip that snaps over the front just breaks off soon as look at you.
please leave feedback! its the first thing i have uploaded. Be kind :)