This is a flag pole that can hold either flat or wavy flag plates. The flags I have designed can be found under my profile sage117 | Published - MakerWorld. 

I have a sphere topper for this flag pole. Square Flag Pole Topper - Sphere

Under my profile I have both a square flag pole and a round one Round Flag Pole by sage117 - MakerWorld, so you can choose whatever your preference is or print one of each. I provide difference thickness for the hole which the flag inserts on both models too. The smallest tolerance has worked for my flags but figured I would post some variance in case people needed.

The square pole prints flat and to assemble just press the pole through the base. Please test that your flag fits with tolerance you selected before inserting into base to make sure works well for you.