Print horizontally, or it will break along the layers (see screenshot).
I printed it in PETG with 100% infill, swapped out both sides so the car sits flat.
The author remixed this model.
Remix of the excellent work of Cassiano Rabelo (@airydisk) over at myminifactory.
Strenghtened the axle part by doubling up the wall thickness of the axle, after my son broke Cassianos version every 3-4 weeks.