Fixing models for STL Export - non manifold edges etc

Rhino Rhino for Windows
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I’m trying to fix several models for export to STL and print, to be honest i’ve losing hope and feel like the work i’ve done is now a total waste of time. The place i sent for the casting said the models are not possible to fix. They all have different issues which I cant / don’t have the knowledge to fix. I use rhino for architecture but we never print anything so this is all new issues to me.

Starting with this first one, i have divided the model in to the part that is most issue which is the head, can it be fixed or am I wasting my time here… If so how do i model this correctly so it can be printed, any help would be appreciated.

This is before i joined everything together so not the actual model exported

001_GeoRose_STL_EXP.3dm (5.2 MB)

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Hello - it is a bit of a mess - the outer shell of the ‘pettles’ has a lot of nonmanifold edges - the rest seem OK so far and can probably be unioned if the outer shell petals is cleaned up - ‘Layer Pettles L1’ That object has zero thickness at the ‘top’

image
image969×869 60 KB

as well as the non-manifolds.

-Pascal

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*edit
i remade the shapes but simplified the number… same issues… if not more
all the meshs are good before any union, most either don’t union or autodelete… takes me 1 hour to model and 3 weeks to fix to print…
how can i achieve this model? must be a way… another way

001_Head_forum upload.3dm (409.4 KB)