Cool little fidget to help pass the time and keep busy hands occupied. The middle piece goes together with just a drop of superglue, once the glue is set it is very solid (I've dropped mine many times on concrete and its still going!). The bottoms of the middle print with 0 bottom layers, feel free to change up the infill design to your liking! - pictured is the honeycomb infill. For a smooth surface simply just add a couple of bottom layers.

Enjoy :)