“Hi everyone, I have 3 surfaces that I want to merge into one. Using Join works, but Merge Surfaces doesn’t. I get the error: ‘Edges are too far apart to merge.’ Please help me fix this. Thanks!”
Surf.3dm (557.6 KB)
You can achieve it with ShrinkTrimmedSrfToEdge,
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"Thank you so, so much! I’ve searched on Google and Reddit for days, but only now do I finally understand. Thank you very much. 
Can I ask one more thing? Why does the Merge Surfaces command work well when I extrude from one edge of a surface, but it doesn’t work on other parts—even though they seem to be right next to each other?"
You can get the answer from the help document about MergeSrf
The MergeSrf command combines two surfaces into one surface at untrimmed edges.
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Note also if the surfaces are all to be extruded to the same height, you can simply join the curves and extrude as one single surface (if the curves are all at least tangent).
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