My kid's rocket ship kept tipping over until I cut a slot in a second box for a cross base
Every cardboard rocket I built for my 5 year old in our garage in Tulsa would wobble and fall within a minute of play. I grabbed a second Amazon box, cut a 3 inch slot halfway up its side, and slid the rocket's bottom flap into it so the two boxes crossed like a plus sign. That cross base has held up for 3 weeks of daily launches and crashes. What do you all use to keep tall builds from tipping over?