2 by 6 duplo brick with 4 peg for wheels with wheels, really tight. Printed with PLA 100% infill. Wheels should be drilled out with 10 or 10.5 mm bore. This thing might be work in progress.
Small update on this one: Kid still have not broken it so it should be sturdy enough, printed in PLA.
4wheels-duplo.stl | 402.4KB | |
cart-duplo-4w.stl | 365.7KB |