Twist-Adjust Cup Stacker

***Updated 11/17/25 - Realized the threading did not have the optimized clearance. Corrected this issue so the top and bottom should thread together easier. An adjustable 3D-printed stacking aid for mugs and glasses.The geared arms expand evenly as you twist the top, allowing you to safely stack cups of the same size.Available in two versions:72–105 mm (large)52–85 mm (small)No glue needed — just slide the gears in and screw the top and bottom piece togetherThe design uses interconnected geared arms that expand or contract together as you twist the top.Just place it on top of your mug or glass and gently tighten — the arms will grip the rim evenly, letting you safely stack another mug on top.The mechanism keeps everything centered and stable.Two size options are available:Large version: fits cups 72 mm – 105 mm in diameterSmall version: fits cups 52 mm – 85 mm in diameterIdeal for standard mugs, tumblers, and many glass types.AssemblyNo glue required!The gears slide into place within t