This is a modular pen holder; there are 7 modules to choose, mix and match to your needs. It is divided into 6 sectors, but some modules cover 2 or 3 sectors.

These are printed in vase mode and involve some vase mode trickery to make the upper horizontal shelves in some of them. I suggest playing with the layer slider in the slicer preview to see that.

Print the modules you want, and the two rings. Place the modules together and screw the ring onto them; it's a bit finicky, but you only need to do that twice (bottom, too). Note that the rings each have one chamfered edge, which goes to the very top (or bottom on the bottom side).