I've been 3D printing now for a few years and have collected countless spools of filament. I have my lab/shop in the basement and my joists are exposed. I decided to create this little hanger so I can use cheap 1/2" PVC pipe to hand my spools and other things from the joists. I just use some simple screws and cut a piece of PVC long enough to span the gap. I designed it with two screw holes so if you are hanging something pretty heavy you can double up on the screws. Normally, you just use the center hole. Works great.I only print in ABS and for a part like this I used 250 microns and about 75% fill. So far this works well. If you're worried about strength, maybe do 100%.