About this 3D model

this is a derevitive of http://www.thingiverse.com/thing:9002 i made a few changes : 1. reduced the overall hight. 2. made it for the 1.3a version - has a liitle diffrent dimensions (size and connectors loacations). 3. made a net for the fan since over time alot of dust comes it - this shuold help a bit. 4. made the snapfit connector diffrently 5. added the option to close with bolts 6. made the hole for the bolts 3mm 7. made the thin wall a bit thincker