This is a down loaded part file. Even though solid features have been selected merged result option the solid bodies show 4 separate solid bodies. What is the reason?
Either way. If the profiles do not intersect, or extrude to meet another body, the extrude feature has nothing to merge to, and therefore doesn't merge regardless of this setting.
The bodies are extruded in the same direction with profiles that do not intersect? Which would make sense for a full extension runner that this appears to be. Not sure why it was modeled as a part though. I'd prefer it as an assembly myself.
It is a part of a assembly file.
Your bodies don`t intersect or even touch each other, so you`ve got four separated bodies
Problem is merged result option has been checked in 4 extrusion.
And they are merged, look
Retrieving data ...