Flattening the bottom

The bottom of the mug, while flatter than before, is not perfectly flat and is therefore not suitable for printing yet. However, there is a way to use the scale operator in Edit Mode to make a flat bottom, by carrying out the following steps:

Without touching the mouse carry out the following steps:

Rotate the view and notice that all the points that were there before are still there, they are all just on the exact same z level making a perfectly flat bottom for printing.

Remember to save (Ctrl + S).