CAD files for the case ?
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 For DIY case it is essential to 3d print the case. I saw that STL files are available but these are impossible to modify. Can you please post STEP files ? 
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 stl can be imported to step 
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 @drwino I've not seen any designs available in STEP format. DXF and DWG formats are available via the link below, along with some 3D design examples. Note Zazardev's Proto design - he managed to alter the original Proto STL at least a little as he filled in the holes in the frame. 

