We had an old small faux Christmas tree, but the stand had broken off. My son wanted to set it up in his room, so I modeled and printed this stand (in red, per his request). Works like a charm. The internal diameter fits a ¾" (19.4 mm) diameter pipe. The whole thing is 7.87" (200 mm) in diameter so it fits just fine on an Ender 3/Prusa i3 MK3S bed.

There are two models; one without the boss on the legs and with the boss on the legs to reduce filament usage.