Turning loft to solid to 3d print

[laurent_delrieu]

If you want a look more like the reference picture, you could apply some Shrinkwrap if you are in R8

Rhino 8 Feature: ShrinkWrap

ShrinkWrap lets you create a wrapped mesh from mesh, NURBS geometry, SubD, and Point Clouds. Just about anything! ShrinkWrap meshes are ideal for creating: Meshes for 3D printing. A solid union mesh from multiple input objects. A solid mesh from 3D scan data fragments. Meshes without internal self intersections. Offset meshes for shell operations Reverse engineering workflows Point cloud meshes Valid closed meshes from broken or often hard to repair geometry. [0648] [ShrinkWrap] …

2 mm offset

Or some offset using mesh tool.
Here a model done using Dendro in Grasshopper, some smoothing and transforming that to quad mesh so it can be smoothed again usin Subdivsion technique “Catmull & Clark”

First populate you object (surfasic or solid) with a tool to populate, here tool from Nautilus, it is faster than populate from Legacy Grasshopper
The offset of 2.5 mm using Dendro and smoothing

Then Quadremesh to get a nice quads

Then you can resmooth or transform it to subd

solidify.gh (103.6 KB)