Created this to replace a bolt my kids lost. Also wanted a file on hand to expand on the system and create my own models for them to put together at some point. Fits as snug as the original.

Printed with a small brim at 10% infill. There is a 0.4mm layer that bridges over the hole that extends all the way through the model to ensure a proper print. Used a 0.2mm layer height with a 0.4 nozzle.