I wasn't sure what forum to put this in, but I figured this is a good one since I used the tricks I learned from building real puzzles to build these.
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These two cell-phone charms are actually Cubesmith earings, I only exchanged the hoops for the strings and put on some left-over 5x5x5 tiles.
For the usb key case I took three floppy cube corners. Cutting off the wings you get perfect cubes. They were already hollow, I only had to pop off the caps and make one additional hole into the middle one.
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After some light sanding, glueing and painting, I ended up with this:
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Because the original casing of the usb key did not fit inside, I had to crack it open and extract only the chip. Since I could no longer use the original snap-in-place lid, I had to make an improvised closing mechanism that would keep the small cubie firmly attached to the other to.
I created a set of tongues from some plastic sheet to fit into the tight space between the usb key and the casing. The key is wrapped into a layer of masking tape and some electrical tape for protection and superglued to the case.
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Finally, to make sure the lid won't fall off, I superglued a small magnet to the bottom. This keeps the lid attracted to the metal part of the key. As you can see the lid now sticks to anything metal. A quick Google search confirmed that the magnet should not erase the data on a flash drive since it's actually a ssd, not a hdd.
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