Our countdown includes NASA and Blue Origin replicas as well as Estes models with cameras and STEM sets for kids.

But pointing out that lightweight cardboard tubes can be tricky to ship without getting crushed, [Concrete Dog] has come up with HEXA, a clever model rocket kit that uses pre-scored cardstock instead.

While melting and casting the Sorbitol-based propellant grains is much easier than a sugar-based concoction, the Sorbitol had much less thrust than a typical sugar rocket, making it the perfect ...