Absolute beginner's introduction to using Block Code to parametricize TinkerCad

It doesn't overcome all of the limitations of TinkerCAD (points to anybody who can come up with a block that semi-automates chamfers and fillets), and block code is inherently limited itself of course, but they are certainly a good match.

I worried during the intro that I wouldn't be able to handle the Youtuber, but he settles down after a minute or so and does a kid-friendly but calm and useful tutorial.