by vannskang, published
This is First 16'inch FDM Balance Bike which works in real.
3DPBB (3D Printed Balance Bike)
http://www.semaker.com/productdetail/1934
This is a milling(Laser or CNC) part for 3DPBB (3D Printed Balance Bike).
HOWEVER, YOU CAN PRINT IT OUT.
It is needed for real wheel assembly.