How to Cut an Object Using Knife Project in Blender 2.77: 12 Steps
3 Different Ways To Cut Any Object | Cut & Fill Surface | Simple Methods For Blender (All Versions) - YouTube
Cutting out complex shapes can be time-consuming, and on a curved surface it can be almost impossible to get right. Luckily, there's a tool called knife... | By Blender Secrets | Facebook
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How to cut out a shape in your object in Blender? - Artisticrender.com
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Blender Hard Surface Torus Circle Cut Shape Study by JoshSommers on DeviantArt