This is a little nest for your budgie. There is a hole in the back for their long tail. I cannot guarantee that your budgie will like this, so just make sure, because Mango didn't like it very much when I introduced it to her. The print in the photo is a prototype. The actual model is slightly different.

CAUTION!! USE NON TOXIC FILAMENT, AND MAKE SURE NO "WHISKERS" ARE STICKING OUT OF THE NEST. THEY ARE TOXIC WHEN INGESTED!!

Print Settings: 

Speed: 100%

Printer: Bambu Lab A1 Mini

Infill: Lightning (only use it if you are not sure whether your budgie will like it; it saves filament). 

Material: TPU (I would ABS, PLA, or PETG for long-term use). 

I would not recommend hanging it up, because budgies are curious and will chew on pieces of the layer sticking out, so I'd put it on your desk as a "perch" so you can watch the bird. This way you can stop them from chewing because you have supervision. The hole in the rear is for the bird's tail.