I first tried to "Separate Connected Surfaces" which created an inverted copy of the model. This might work if i try to print the model but I feel a bit worried because it's two models involved...? Then I tried "Identify non-manifold edges" which seems to do the trick. There seem...
I have an .stl file that I've been printing on my old printer with no problems. Now I did a reset of my simplify3d when I bought a new printer and the same file looks strange when I try to prepare it for print. I'm obviously missing something simple but I can't figure out what it is. Simplify error....