Infinity double ball with massage effect

This Infinity toy has small spikes. It stimulates the hands while playing and can be used like a massage ball. New: When the spikes are folded outwards, there are pairs of spikes on the inside that interlock, making the ball more stable for massage.The inside is now also a ball. Printing Use PETG for the hinges. If you want a firmer feeling, use the hinges with “strong” in the name. These have a pretension of 3 %. I only print the hinges with PETG-CF. Then they are super stable and still have the necessary elasticity. Please take a look at my other infinity models: Infinity Cube with massage effect infinity-sphere-in-an-infinity-sphere   halved-cube-puzzle-fidget    infinity-cube-with-balls-inside   flat-pocket-infinity-fidget-toy