I'm pretty sure people do offer printing services on Etsy, too. They charge a fee and you give them the files you want printed.
Also, when you download stuff from Cults, there's also an option to see about estimates for getting the stuff 3D printed for you from 3D printing services.
The problem is i dont have experience with 3d modeling and don't know what size the model is. I was just messing around in tinkercad
Bring into cura. resize and exported as an obj after the resize. If you know the size you want it. go ahead make changes in Cura into you get the size you want.