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In addition to being a wonderful puzzle and fidget toy, this was a surprisingly fun test & motivation for improving dimensional accuracy. If any of your three axes are out of proportion, it really shows in the assembled version. (I also printed different parts of the same cube on different printers, which forced me to make them consistent with each other by actually aligning them with the physically correct rather than just proportionally correct dimensions.)

All-in-all, this has become one of my favorite models.