I hope you are doing well.
Sorry I do not have much time to digg into your model. Pretty cool model :-).
Tools->Check shows some open surfaces. I would recommend use Boundary surface instead of lofted surfaces, as my suspicion is that your lofts probably are stretching a little out of shape.
Hope you find this helpful.
Have a great day!
I am doing well, especially since your advice helped me rebuild my handle to a way better outcome. Thanks alot for the generous assistance.
This is a better model than is usually presented by people asking this sort of question.
I personally think that you shouldn't use "thicken". I think the shell approach is better. The reason is all of the junk you see at the suck end of the device. See how those faces are all broken up? A proper shell will be much better. Unfortunately, the proper shell will be more difficult. I'd start by deleting the Thicken 2 and 3 features.
The first thing you have to do is to fully enclose the surface, so use a planar surface to cap off the suck end.
Then it gets tricky. Surface models need to be without gaps or overlaps. To make a surface a solid, you have to have a body just including the outside faces, all knit together. So you have to trim Surface-Loft18 and Surface-Revolve1 with Surface-Loft17. Use a Mutual Trim, select all 3 surfaces, set bodies to keep.
But first, I notice that you've got a problem you can't recover from. There is a gap between SurfaceLoft28 and SurfaceLoft13. Gap in this case means a distance between edges. It looks like 3DSketch93 is close to 3DSketch37. You shouldn't use two separate sketches that do the same thing. And using 3D sketches where all you need is 2D can also cause problems.
I personally would redo loft28 to use edges rather than the 3Dsketch93. You're going to need the SelectionManager to select multiple edges as a single profile.
That will help you most of the way.
Best of luck.
Your a machine. A massive thanks for taking the time out. Thickening was a problematic but turning it into a solid was relativley easy and it ended up with a 2mm shell. With your advice you actually put me ahead of thh teacher trying to suit the same model build. Ill tone down on the 3d sketches too.