Lots of my objects are small (to fit on my 3D printer bed), and often come from bigger things. Either way, they often end up with tiny detail, particularly if I'm chopping something into bits and stuff. Sketchup doesn't like the tiny sizes and seems to have rounding errors or something. Lines won't connect, faces won't appear, stuff gets broken, etc.
The follow me tool in particular is egregious, it can't even make little spheres.
Workaround seems to be to make it 10x or 100x bigger. Then do whatever I want, then shrink it. It seems like Sketchup was designed for building floorplans, not desktop trinkets.
Sketchup should figure out how to rescale itself internally so that it measures in um but still outputs in mm or something. Eg: hide my 100x (or 1000x) hack under the covers so I don't have to deal with that manually to get the resolution I need.