Solid.by.loft,

Any tips on why i cant create a solid? the crossections are poly already but the note of null keeps appearing. Apreciated

You’re passing both empty lists and lines. You’ll want to build a polycurve from each closed loop of lines (PolyCurve.ByJoinedCurves), which may be difficult as there appears to be a cavity shape which won’t work unless you separate the data.

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Thanks for the help @jacob.small ! About the empty list already took care of it and the solid.by.loft is working.

But would like to know how you would solve the cavity issue. Ok, i could make 2 different families and upload them separatly but i dont think it would be the best option. Maybe list management in order to take whats the top and bottom and them aply 2 solid to each group? Really apreciated

I recommend logging solid A and solid B to get two descrete solids, then use a Solid.ByUnion node to merge the two solids into a single geometry before sending to a family.