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I have been using Blender to edit STL files for resin 3d Printing.

I have an object that I want to cut and I create the shape I want to cut out of it, but when I give the ⎈ Ctrl+⇧ Shift+ - command, the two objects are joined.

I select the cutting shape, hold ⇧ Shift and select the part to be cut, then give the ⎈ Ctrl+⇧ Shift+- command, and about 50% of the time it will join the items. The other 50% it will cut the way I want it to.

Why?

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Use the Boolean modifier in Properties > Modifier Properties > Add Modifier > Boolean, and choose the object you want to cut with, in the menu for Object. I'm not sure what Ctrl Shift - shortcut does.

cube

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In bool tools, there is another shortcut key Ctrl + Shift + + for union operation or u can use the Object Menu.

1] The Ctrl + Shift + + method

Bool Tools 'Ctr Shift +'

Here is the wireframe

Wire Frame

And here is the mesh in x-ray mode, as you can see there are no redundant faces.

Mesh

2] The Object Menu, u can access all the bool tool operations from the object menu.

Sorry For the long menu!

Object Menu

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Instead, use Ctrl + Numpad - to leave the modifier on the object. Look at the options on the modifier and check to see if the Fast Solver cuts the object like you expect.

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