Exclude part of model when using cut tool

OK. I see your situation but the solution in this occasion would use cube privatives scaled to the shape of a knife blade and then using the union tool with the “difference” option to cut the parts.

NOTE: all colors are just for illustration purposes. They don’t matter.

I created a crazy shape in CAD I’ll call race track. It clearly does not fit on the plate.
Then I will create a Cube primitive and make it 25x75x1mm wide to use as a blade

I move the cube over the section of the race track and assemble them.

Once assembled they act as one part

Notes that I have selected the assembly then selected the Union tool. I use “Difference” to tell the racetrack that I will be using the cube to remove anything that the two models have in common. If I check “delete input” it will remove the cutting tool after I click “difference button”.

Note that I still have one part but it’s missing a notch and now the “Part” tool lights up in the tool bar but I want the objects menu to split them into individual objects.

I then Split into objects.

Now that I have split it into to object. I just repeat the same process over again for the next section. If I have an angle, I first rotate the Cube tool into the correct position.

Once again, I create an assembly and then repeat the difference cut.

Note that the right hand bottom of the screen after I hit arrange, all my errors go away.

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