High capacity Pen/Pencil/Stationery Holder or Stand

I've gotten into stationery for planning, diary and sketching projects and have begun acquiring quite a few pens and pencils. I wanted to have them handy on my desk so I designed this 4 shelf stand which holds them at an angle. Depending on the size, each shelf can hold as many as 8 pens. I also keep my 150mm clear ruler on one of the shelves.

No supports needed if printed with the shelves vertical. I recommend random seams. The photo shows the stand in Prusament Galaxy black.