Marble run gate

thingiverse

This design fits snugly over pipe insulation with an interior diameter of one inch and an exterior diameter of two inches. This popular tubing is commonly used in creating complex tracks for marbles to navigate. Simply print this model, add a pivot through one of its pre-drilled holes, then snap it onto the insulation pipe. Finally, position your marble behind a removable gate and release the lever to set the marble free, allowing it to roll and glide along its intended path.