Since I didn't happen to have any toy wheels just laying around, I designed some to be printed.Changes from original: -Added sweet rimzzz -Exhaust port changed to round hole, increased size to 7mm diameter. -Wheel mount holes changed to fit small finishing nails -Added lip to balloon stemExtra Hardware needed: 4 Small finishing nails (3d 1-1/4") 4 m3 washer or similar tiny sizeI've only printed one of these so far and the nail holes were originally way too small. It was bending the nails trying to hammer them in! I had to drill out the holes a tiny bit for a good fit. I changed the script to make slightly larger holes, so hopefully this will work for other people without the need to drill.