Printable Interlocking Puzzle #3 - Level 4 by Bram Cohen

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I'm thrilled to showcase a brand new Printable Interlocking Puzzle Cube that I didn't create. After releasing PIP#2, I received an email from Bram Cohen (puzzle designer and creator of the BitTorrent protocol) asking if I had discovered printable interlocking puzzle cube designs with a difficulty level higher than 1, requiring more than one move to remove the first piece. This challenge seemed like a great opportunity, so I set out to design one, but Bram ended up beating me to it - twice. In his email, Bram explained that the main obstacle was that the printed bottom of each piece can't face outward directly, as this would allow it to be easily removed on the first move. However, placing the most voxels on the interior makes it difficult to fill all the external voxels without blocking the internal ones. His initial attempt resulted in a level 2 puzzle cube, but he soon surpassed that with an incredibly clever level 4 design. UPDATE: Thanks to mateddy's outstanding work (see http://www.thingiverse.com/thing:569118), I can now offer this puzzle in OpenSCAD format. If you enjoy this challenge and are looking for another one, consider purchasing my latest and most impressive design from here https://pinshape.com/items/42609-3d-printed-printable-interlocking-puzzle-4-level-11-by-richgain