Large Axle from Lethal Company. Modeled by hand to match the asset in-game since I couldn't find a great printable model online. PRINT AS MULTIPLE PARTS

To print, download the LargeCog, SmallCog, and ThinRod (x2), and print separately. Or, download the 3mf and separate them yourself. The part is designed to fit together with friction, YMMV depending on your printer. If you have issues fitting things, the parts can be scaled up or down slightly.

To print the thin rod, you probably want to do it on its side. This will cause elephant's foot which can be avoided via slicer settings or just some post-processing.