I’m modelling a pen in Fusion 360 and have already shelled the main body. The challenge is a small push-button that I previously moved into place and combined with the body; ever since, the shell command fails and throws errors around that area. I need someone who can: • Diagnose why the merged button geometry blocks the shell operation. • Edit the timeline or feature tree so the body—including the button—can be shelled cleanly again. • Return the repaired .f3d file along with a brief note (a couple of lines is fine) describing what you changed so I can learn from it. This is a straightforward, one-off fix. If you know Fusion 360’s Combine, Body Interference, and Shell tools inside out, it should be a quick job.