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Old 8th June 2018, 07:09 AM   #4
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Join Date: Jun 2003
Posts: 4,459
Default Re: how to use the knife tool ?

There were a few problems in the model. Both surfaces on the end of the block were not joined to the the other surfaces. I deleted those and then tried Object->Fill-Hole. This failed because there were other holes in the block. Using Object->Optimize-vertices removed lots of duplicated vertices and then Fill-hole worked fine to close the ends of the shape.

The sphere had artifacts (split surfaces), probably left over from other experimenting, so I made a new sphere, and copied the dimensions.

After that, a boolean subtract seemed to work fine.

Here's the file with your original model plus the fixed parts and the subtraction result:
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