Part 2/3: Variable and parametric designSo far we used only "hard coded" numbers (see the previous part regarding the basics of Openscad).
Hard coded numbers are mostly always bad. Seriously: when you use Openscad you probably want NOT to use hard coded numbers, but variables instead, as you get lots of advantages in doing so.
A larger mug by using the scale operator (from the "basic" tutorial).
This is still not parametric, as numbers are hard-coded (a bad practice).