Billy / Oxberg doorknob, cylindrical for glass-doors

One of the wooden, white painted doorknobs was missing in my bags when I assembled the billy/oxberg bookshelf combination.
So after a while, I now have shaped and printed out my replacement part for it.

In case, anyone experience the same missing part, please feel free to use this stl.
I did not try to get to IKEA to ask for a spare, for I imagined it would be hard and/or expensive.