Generally, you can add tabs and supports in the CAD software but MeshCAM lets you do this while you are converting your file to G-code. These supports also hold the part in place so that you can cut the top surface without worrying about the clamps getting in the way.
This ensures that the part you want to cut out remains connected to the stock material and at the same time, the tab is thin enough to be broken off with a little bit of pressure using your hands. What this does is it leaves a thin section of material uncut on the sides. You can add support tabs on the edges of your designs on MeshCAM.
MeshCAM has a neat workaround for this issue. Sometimes they get in the way while cutting and damage the cutting tool. Clamps and vises are commonly used to hold the material while machining.
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