3d Printed MarbleMarble MachineMarble RunHandcrafted Kinetic Marble Run Machine – Desktop Fidget Toy, STEM stimulation toyHand-tuned 3D-printed kinetic marble machine — a mesmerizing, battery-free desktop fidget and STEM gift that cycles 30 steel balls via an Archimedes screw. Handmade in the USA; fully assembled and ready to run.At MarbleMachinesShopUSD 79.97See gift
