Loose seams. Missing part

[jwalter007]

I modeled a part using sketchup web. I'm not experienced so I eventually fumbled my way through.
I have a small dome with 3 components connected to it. First print left some space at the connections and the parts fell off.
I eventually figured out how to make sure the parts were solids and then used the union tool to make it one complete part. Was better, but not perfect.
2 Questions...

1. Is there a way to tell simplify to make just those areas have a higher res or something so the connections are better?
2. My last drawing edit has the longer top part showing up great, but when I do a print preview, that part disappears?

I'll attach the part and some screen shots
(I dont have simplify on work pc so I can not post a screen shot)

[gwhite]

I've had issues with .STL files from Sketchup. They look OK, but they don't slice well. I'm not sure if some of the "repair" programs available will help or not.

https://all3dp.com/2/stl-repair-fixer-t ... e-offline/

[dkightley]

Have a read of this thread:

viewtopic.php?f=9&t=3096&p=13400&hilit= ... ted#p13400

It explains a super simple way of sorting out issues where multiple parts are put together in some 3D packages.

[jwalter007]

Thanks guys.
I ran the model through some of the online repair apps and its good now.