These make a very nice ornament to cover the lights on the christmas tree. This is an improvement on my other designs. It is designed as a shell (should print by default as 2 shells/ perimeters). This means there is no infill in the walls). There is a small lip at the base so it can be printed on its base. You add a brim or not. I print with zero (NO) supports on my Prusa's. You can get a little sag but its not really a problem.