Creating a closed polysurface for 3D printing

Hi All-

I have a few objects I’m trying to prep for 3D printing. This one in particular is giving me a headache because I cannot make it watertight. I think its 95% of the way there. The first thing I did was explode it and SelBadObjects whereupon I found two problem areas. The first area I fixed with RebuildEdges, the second one, well, I tried a lot of things, and now it doesn’t appear as a bad object, but the whole model reads as an open polysurface. Here is the model in question after I messed with it quite a bit:

open_polysurface.3dm (1.8 MB)
Here is what I believe to be the problem area, right around this standoff:

Here it the model as I received it:
original_open_polysurface.3dm (2.5 MB)

Any and all advice much appreciated.

Happy New Year,


Hi Revel - use ShowEdges > Naked edges to see where the problems are.

  1. ExtractSrf and delete the top of the round boss that shows nakeds. Use the Cap command to re-close it.
  2. Use the test command testRemoveAllNakedMicroLoops to close up the other naked location. You’ll need to type or copy/paste the entire command - it will not autocomplete.

Any luck?


Hi Pascal-

Here’s what i get when I show naked edges:

What do you mean by ‘ExtractSrf and delete the top of the round boss that shows nakeds.’?

otherwise I think I follow you.



Oh! you mean delete the top pf that standoff?

it worked! you are amazing thank you so much.