I reverse-engineered real Beyblades and their launchers, redesigned for better aerodynamics and spin duration, and printed the result until it beat the originals in spin-speed testing.
Fig. 1 Printed components after final spin testing.
The design was the quick part. The week that actually mattered went
into printer and slicer tolerances on an Ender 3 Pro. The interlocking
parts are small enough that a tenth of a millimeter decides whether the
assembly snaps together or spins apart, and no amount of CAD fixes a
first layer that is squashed.
