To train new members on the team in Fusion 360 CAM and CNC mills, the PSP Lego Brick is a fun training part. It is pretty simple, but does still expose members to the most common toolpaths used in Fusion. It requires members to think about how to probe the part during op2 to ensure alignment between the operations. And at the end of it, it is a nice desk ornament. I have led many workshops where I go step-by-step how to create the CAM for the PSP Lego Brick and got dozens of members trained up with this part.