Problems with Cura

So Im new here sorry if this is in the wrong place. did some digging and found nothing on this. I’m using 2014 pro to an ultimaker 2. Ive got 3 tubes coming together to a single tube of equal size. I have had luck with other revisions but not the newest ones. When I export the .STL, then load into cura, only the outer shell shows up and not of the inner working. Ive changed faces on the inner workings and nothing, outer too. Any help would be great

Did you make the model “Solid” in Sketchup first? If not, here are some tips to get you started: 8 Tips for 3D Printing with Sketchup -

Thank you d12dozr, I use a couple of those tips. after some working and trying a blender model print we found the problem was in the 3d printer software, we had to use the quick print on import, if we used normal it has issues.

Glad to hear you got it sorted!