Hi Carlos - I would start with a template at .001 units - build your stuff, and if (as can happen) you find that you cannot easily close things up, you can, as a last resort, or a quick fix, back the tolerance in the file out to .01 and try to join things - if the key is to get a decent closed mesh out of the object, having supre fine tolerances may not be crucial, but Rhino is happiest at .01> .000001. If you keep that .01 as the 'fall back' tolerance, you should be OK. BTW, a tricky hidden test command that comes in handy when trying to close things up and seeing those pesky 'point' naked edges when anlayzing for nakeds (
ShowEdges command) is
It can get many if not all of those tiny nakeds. Type the entire command, it does not autocomplete.