How to avoid a double shape when extruding with the mirror modifier I'm following this tutorial from Andrew Price to create an Anvil and when I extrude a face it creates two shapes instead of one. I don't know where the problem comes from and how to solve it. See a screenshot here:



On his video when he extract it, it creates only one shape:



I don't know what I'm doing wrong and how to solve it. Thanks alot!
Press B when you inset the face that you are now extruding, so that the ends which are matching the other mirrored side are joined together at the middle. You might have missed the part where Andrew explained this problem in his tutorial at 07:12. He explains it quite well so sure you will understand.