Inspired by proyz 2.5HDD Support Mount for XBox360 Slim http://www.thingiverse.com/thing:5395 requires a modified firmware of 2.5 HDD 250GB or 320GB Made it in whole so that you can secure the HDD. Though I haven't tried printing it. will post more pic once i tried to print.
Update 23/07/2014: The size is a little big or basically the shape seems to have not match so I have to edit the SKP file.
Update 24/07/2014: Adjusted and created a space so that you can remove the hdd easily.
Update 31/07/2014: The case was too long. reduced from 105 mm to 95 mm. Added a slot where you can put anything that will allow you to pull it out of the Xbox