Made a small shelf for a few books that also will hold 3 spools underneath it. I made the arms have 4 mounting screw holes however I don't think you need 4 screws per arm I just did 2 of them and its holding fine with just drywall screws. My spools are empty I don't know how strong it would be with full spools. Hopefully this can be a space saver for someone like it was for myself. I printed with basic PLA from Bambu at 25% strength and 3 walls.
Enjoy

Book Shelf Spool holder

book shelf arms.3mf

This was made for my long robe so I can keep it off the ground. I didn't find any on here that I liked or maybe I didn't look hard enough so I made my own. Fits my interior doors in my place very well and is very strong for what it is.

 I printed this in Petg-Cf at 100% (because im testing out Petg-Cf on my printer). I Imagine this will take to Pla even easier so I don't think printing this will be an issue for anyone. I hope more people can make use of this fairly quick print that is surprisingly useful in the home for a variety of things. 

One Note is I modeled this for a door I don't close so I wasn't concerned about the top clearance. This Door wont close with the hanger on but I made one for my bathroom as well and that door does close so it depends on your door frame. 

The inside diameter of the part that goes over the door is 1.4" 
The Thickness of the Print is .2"
The width is 2"
The Overall Height is about 5.2"

Door Hook Clothes Hanger

clothes hanger v2.stl

Beer Tap Display Stand

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Book Shelf Spool holder

Door Hook Clothes Hanger

Beer Tap Display Stand