3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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I second the other comment it’s best not to handle it in slicers.
Rather, I’d suck it into your favorite modeling software, then create a sketch with a cube that fills the space you want to cut (so one face is the cut-plane and the rest of the part is inside the cube.)
From there, duplicate the part you’re trying to print and use the cube to “intersect” the part- which makes it so that copy, only the stuff inside the cube exists. On the duplicate, you can then use “cut” to remove the bits you just created.
In Fusion 360, the function your looking for is “combine”, you don’t need to duplicate the mesh part just toggle “keep tools” (I’d also suggest “new component” as well.)
While you’re in there… I would create a sketch off the net cut plane (either side,) and then create registration posts. Shallow is just fine, but you want a something tapering to a solid point so that as you’re gluing up, it aligns itself. (A shallow pyramid also works, whatever angle youre printer can handle overhangs is fine.)
Inside, you’re joining the extrusion the other you’re cutting (and creating a void.)