Stand for Dnd trading

I dont own 3d printer but really want one day.
I was trying to make this model 3d avaible for 3d but the model itself "fine"almost but the 3d program that slice it dont see alot of things.and its weird.
idk what about this one well maybe change it a bit so 3d printer print it more good.
anyway take it i share it for free created from cube.