Replacement Wheel for Print-In-Place Excavator

I printed the excavator from whopperprinting for my son and within a few minutes he'd managed to break the wheels. Rather than waste the excavator I figured it would be a simple process to design a replaceable wheel that can just slot into place. It's sized just to fit in, 8.5mm wheel with a 4mm shaft at 48mm total length when combined. There's a 2mm hexagonal hole and the peg is 1.8mm wide. The jointing clicks together with a satisfying snap. In the picture the replacement wheels are the ones that are all one colour, if all four were the same colour you wouldn't be able to tell which ones were the new ones. Printed at 100% for strength, no raft, brim or skirt. No supports. I would link it as a remix to the original file: https://www.thingiverse.com/thing:5449036 however it appears that they don't "allow" remixes so let me say clearly that I used their design as inspiration and remodelled the entire wheel myself using 3D Builder (surprisingly versatile software for simple things like this). All credit to the original design from whopperprinting. You've made my son very happy.