Whats it look like on the G-Code tab ? thats the representation thats sent to the printer - object placement is just a 3D rendering of the STL. Have a look at the model by adjusting the 'layers' sliders to view what the middle layers look like etc. Click on 'show layer range' and drag the bottom slider halfway...
Which version of Repetier-Host ? the now about 5-versions behind Solidoodle distributed version ?
Anyway - to disable infil, you actually need to set infil to 0 on the infil tab... However, infil is not the issue here since if you are printing the case halves it wont generate infil as there is no top to it (you can have infil floating in space.. it would only generate it if there was both a 'top' and a 'bottom' and the infill goes in the middle...)... which way are you printing them ? you want the 'top' of the cases on the bottom.. so the walls protrude upwards and there is a big void there.
Theres no errors in that STL file as I just downloaded it - so perhaps its just one of the models that older versions of Slic3r/Repetier-Host (they are two different programs 'joined' in the middle - both have more recent versions than that shipped by Solidoodle)... but it slices just fine on Reptier-Host 0.90C and Slic3r 0.9.10b:
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