I used the “Dave Method” and created a copy of the component with the cutting face inside it. That copy was scaled up. I usually scale up by a factor of 100 or 1000 because dimensions are easily converted when needed. I did that before making the GIF so the GIF shows working on the scaled copy. After completing the cutting and cleaning, the exit the edit mode for the component and delete it. Return to the original and it’ll show the same thing.
Although I rarely have need to 3D print my models, I have found that making and keeping components “solid” results in models that are easier to work with. A little cleanup on the original component (closing a couple of small faces and erasing some unneeded edges) resulted in a solid component.
Adding the cutting face, copying the component and scaling up the copy…
You could add the cutting face to the enlarged copy but it’s often easier to figure out where it needs to be placed on the original, full sized one.
After cutting and removing the unneeded bits and then deleting the large copy, the component has the face at the end and is still considered solid.
