fill mesh holes or connect edges?

hello everyone :

I'm doing some work and finally for RP machine to print out

but now have a very hard problem I can't solve:

for RP machine, there must have a "closet brep or mesh" that can be print,

because it is determined to be a solid model.

But now I create a mesh that have many naked edge(purple highlight),means not connected, can't be printed by RP, it's not solid after I thicken.

I done this already use wbJoin and weld verties before,

please does anyone know how to fill or fix this into one brep with perfect?

I use "face nakededge" and edge finder(written by David) component

just find edge and vertice,  but how to fix it?

if anyone have some suggestion I'll very appreciate, I'm stuck here for days and have a difficult night...

thanks