I am using Sketchup-stl for importer on SU make 2015.3.331 and having a lot of problem importing stl files.
Very simple models do not seem to be an issue when using cm or m scale. Without it problems exist. When I get to larger more complex models SU may crash with a bug splat unless I terminate it b4 it does because I think it is taking tooooo long.
It may import the model with a lot of problems even though I use cm or m. I do not know what dimensions were used in the design. If I load the orig stl in Repetier it is good. If I load the model into SU then export the stl and load that to Repetier it is not manifold. It needs to be fixed. Sometimes I can fix it with SU plugins. Most times I have to resort to netfabn on the inet.
What is the problem???