This kit lets you view the night sky not with one eye, but two, for sharper, brighter, and more comfortable stargazing. It can be ordered as plans only, optics and hardware only, as a BYO 3D printing kit, or a kit with pre-printed parts. In 2022, they’ll also open source the build plans. There’s also a large, assembled model, but it’s much pricier.
THE BEST Stem
Puzzle maker Ravensburger’s kits are a blast for kids and kids at heart, letting you easily assemble fast-moving and complex marble runs. Modular components encourage experimentation, and include loops, magnetic cannons, and other tricks. The starter set comes with 122 pieces, while we’d go for the 240-piece XXL set.
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