Duplo compatible fully printable train wagon

My goal was to make a fully printable wagon compatible with Lego Duplo train set. I decided to replace steel axles (separately purchased) with printed ones.

Some notes on my default settings:
- the frame, the platform and the hook printed with ABS (200um)
- the wheels and the axles printed with PLA (200um for axles and 150um for wheels)
- in my case supports were required for wheels only
- print axles in pairs, they are thin and high (40mm) and slowing down the print may be neccessary at