Question: Your base is 5mm and your square negative hole is 5.1, which allows it to be above the top surface. When you group it will cut a hole entirely through the base. At some point you moved the negative hole up. I watched the video again and you must have done it during the long intermission.
Question: Your base is 5mm and your square negative hole is 5.1, which allows it to be above the top surface. When you group it will cut a hole entirely through the base. At some point you moved the negative hole up. I watched the video again and you must have done it during the long intermission.
I think you're right. I think I'll make a new video explaining it from the beginning since this is probably going to confuse people. Thanks.