Summary

My son asked me to print this for him. Instead of printing it with supports, I edited it so that it doesn't need them. It still fits together and locks just fine this way. I'm always dumbfounded by how people design things and don't keep printability in mind.

You'll need to go back to the original designer's thing to download the peg that holds it together. https://www.thingiverse.com/thing:3561641