This simple knob is designed to replace the default Bambu door handle. I do not love the default handle because it catches on clothing and has a little too small a gap for my hands sometimes. I also don't like how it sticks out beyond the door profile itself visually.
Printed here in Bambu's CF-PLA (red) with the knob face down without supports.
Print at 0.16 mm layer height.
The outer depression is there to provide a little space for the rubber grommet on the door so the knob will fit flush as shown. A sacrificial bridge is included to make this print well without support.