Hello, I have been trying to make this 3d model printable. I have tried every tutorial I have found on extruding the faces to solidify modifier, I under stand the basics of how edit and object modes work, I have asked another blender artist and he showed me a video of a door that had the top part removed then extruded the bottom section for depth the re-added the upper mesh and extruded that, seems to me like more work than is really required. My thought would be to take the non manifold edge all around this fender model and somehow enclose that inner surface to close the model, but not sure how to get there. Any help is greatly appreciated!!!
At least for B4.2.4 there’s no chance to get any non-manifold geo in such case as you shown on the screenshot if geo are okay.
There’s 2 possible problems:
- you have some faces with inverted normals, i.e. specifically only some part of the mesh have inverted normals, like so:
- you have duplicated non-manifold edges
Welcome 
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You may “solidify” this manually by inverting the selection of the manifold edges, copy and move them (maybe edit a bit) and bridge the edges ( Select → Select aLl by Traid → Non Manifold in edge mod eand Ctrl-E → Bridge Edge Loop) like so ( no tries to quads used here yet):
Thank You I will try this
I would personally just delete the rim geo you have currently like this.
Then once you get back to the rimless state re-add a solidify modifier and bring it back to the thickness you wanted.
This will have the rim and filled inner face by default.
Thank you I will try this it seems like an easier approach and could solve my problem!!
Shift E >> Extrude along normal also works assuming the normals are all pointing in the correct direction. Or alternatively, extrude >> alt S ( scale along normal ).
That’s identical to what the Solidify modifier does, only it’s a destructive method. Not quite as ideal IMO
I have done all I know how to do. This model I purchased came as an fbx file, I tried to save as a blender file thinking it would be easier t manipulate, problem is it is paper thin as you can see the tire through the floor panel. Due to the way this model was made it does not thicken/solidify so that it actually becomes solid as an STL file…there are missing layers when slicing on my 3d printing software. I purchased a so called 3d printable version from CULTS and it was missing details and was a really bad 3d scan? as well as an over thickened lost detail nightmare. I spent all day trying to enclose the hood by extruding the front and back edges and joining then joining the sides. I feel like I am banging my head against the wall wasting time
