You only need a little of glue to join the wheel axles.
Recommended print settings - Infill: 15 %, Supports: NO!, Layer height: 0.2 mm.
Note: Lego tolerances are very precise and your printer may not meet them. Maybe you will have to fine tune the model in your slicer (scale/flow/...).
CHECK OUT other models from My Wooden Train Tracks collection!
UPDATE: Added a file for calibrating the model scale to fit Duplo bricks exactly.
The author marked this model as their own original creation.