Shift Happens is a meshing-gear puzzle in the same vein as Pentafold and Gear Fold. Bram Cohen wanted a set of six gears with an unequal number of teeth. After some discussion, he proposed the numbers 10-20-16-12-18-15. The initial idea was to have the gears in a triangle, but the gear set would not mesh that way. The alternative was a hexagonal pattern. As Pentafold and Gear Fold are rather floppy due to their hinges, Shift Happens uses a shifting mechanism similar to Gear Shift, but flat instead of spatial.
Please order a 3D-printed do-it-yourself puzzle kit from Shapeways at this page (check with Oskar about screws and stickers), or contact Oskar directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.