Raspberry Pi enclosure remix

I love the original (from which this is derived by recreating the STL dimensions in FreeCAD) but dislike the 15-20 minutes of filing required to get it to fit together.

The only thing missing here is the engraved lettering but hopefully that shouldn't pose too much of an obstacle.

Some of the side connections end up being a bit thin - definitely recommend using a fine layer height (0.2mm or less).