Genshin Impact Wanderer Hat 3D print model

Haha, wow, you really weren't kidding when you said 'proceed with caution' XD Continuing with my Icarusian habit of launching into hobbies with things far above my skill level, this is my first 3D print; I am using a Kobra 3. I am starting from the base. I had to cut the round part of the base in half, since attempting to print it as-is from the file, it got a little over halfway before getting yoinked off the plate haha. (The overall diameter of the thing ended up being ~15.5cm/6in; is this accurate?) Same thing happened with the base part 2: with less than 30 min on the clock, even a 10mm brim didn't manage to keep it grounded enough. I have heard rumours of things such as "supports" and "rafts". If you have any advice for how to print this, I would be very grateful. Thank you very much in advance!