Sometimes thicken feature with option and sometimes without option. What does determine this?
The first screenshot is because you have a multi-body part.
I understand that only number of solid bodies can determine whether it is multi-body or not. Not number of surface bodies.
No, a part with several surfaces is also a multi-body part. In your first screenshot there are several solid bodies & SolidWorks needs to know which one/ones of them to merge the new solid body with. The second screenshot there are either no solid bodies except the one being created by the Thicken or there is only one other solid body to merge with & SolidWorks can work that out for itself
In this example there are 4 surface bodies and one solid body but thicken does not have option. Same time if I make it two solid bodies thicken does have option.
Yes, that's what I told you. The number of Solid Bodies is only relevant to the Thicken feature options. One or less Solid bodies & you won't get the option, two or more Solid bodies you will get the option but only if Merge is selected. If there are 2, 3, 4, 5 etc Surface bodies it is still a Multi-body part (as there are multiple surfaces bodies) but not relevant to the Thicken feature.....unless you thicken one, then another & then another.......& then only assuming the first two don't merge & form a single Solid body
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