This is my customized Samsung Galaxy Ace GT-S5830 case. It is a remix from "cece25120" (http://www.thingiverse.com/thing:310323)
It has Open Source Software and Open Source Hardware logo, as well as some PCB tracks.
NOTE: Fixed version is uploaded.
Main improvements in V2:
PCB tracks match better with phone.
Speaker, camera and flash adjusted.
Opened side walls to give better access to side buttons (Volume up/down, power, microsd slot)
I recommend you to download the version uploaded on 27/04/14