Object not manifold
When I load this file Host says it is not manifold, but it is perfect - so why does Host V1.6.2 think it is not. Solid inspector2 and SU Solid Pro both say it is perfect.
It is a small object about 9mm round and 4.25mm high with a hole thru the center, created in Sketchup.
I printed one previously and this one is only slightly different in size.stl file here