I made a few changes to the original model from @KCWarthog3D so as to print it without supports and without changing the filament during printing. Now you can print the lid and the butterfly separately.
Additionally, I added pins to the butterfly and holes to the lid for easier and precise assembly. The printing speed for the pins (or for the entire butterfly) should be reduced due to their small size. It's also a good idea to set the infill to 100% for the butterfly. Use glue for pins and holes to create a permanent connection between the butterfly and the lid.
I also made the box fit tighter together now → Butterfly_Box_Bottom_tight.stl
If you want the box and lid to remain loose like the original, just use the original Butterfly_Box_Bottom_original.stl file.
The author remixed this model.
The butterfly and lid are now separate. Print it now separately and without supports. There is also a tighter version for the bottom box.