This model prints without support and can be scaled to your needs. It also makes for a decent bridging and retraction test 😉
Print Settings:
Model scale: 75%
Resolution: .2mm
Infill: 20%
Perimeters: 2
Filament: Amolen dual color PLA
Supports: No
Raft: No
Printer: DD upgraded Creality CR-10
I'm experimenting with using 3mf files instead of STLs. 3mf files will give you a preview of the model in you file explorer, and they typically allow smaller file sizes as well. Let me know if you like the format. Enjoy!