Print-in-Place i2 Engine Fidget (Version 2.0)

This is a print-in-place fidget toy model of a inline 2 cylinder engine. This model is also based off of my original i2 fidget with improvements to printability, tolerances, looks, and more! It is also smaller and has a keyring, designed with travel and filament + time saving in mind, taking only ~30mins to print with no postprocessing required.  In addition, there are 3 variants to this design: 1) A simple 1 sided know design2) A 2 sided knob design making it easier to spin around to hear