Hi Dr Bombs, how did you create this object?
The easiest way to close something like that is to keep it closed from the start by having a closed solid and then use Boolean Difference to cut the solid into pieces. When you do that then the "side walls" of the cutting objects will be kept in the result and you won't have any more work needed to close it off.
> i tried drawing lines and snapping as the red lines show, then planar, didn't work, anyway to fix this? Thanks in advance!
If it's a planar cut then I would expect that what you describe should work. Can you please post the .3dm file so I can take a look at what might be going wrong? It's very difficult to analyze geometry from a screenshot alone, it helps a lot if you can post the .3dm model file.
- Michael
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