This is a hook I designed for the 3d Printing Nerds Spool Holder Design Challenge.
The hook is designed with fillets to easily slide onto square wooden support shelves without having to move spools already on the shelf.
The spool arm is designed to pivot 90 degrees out of the way easily with just one hand when the arm is not in use.
There is a hole in the round endcap of the arm tho hold filament so it won't be loose and get tangled.
The only support needed is on the back side of the logo endcap... it may even be printable without supports as the bridge is very short.
I've added an extra long version of the arm... so everyone can customize the lenght they prefer. With some Slicer software if you print the arm vertically... you can partially sink the model below the print bed and any part below the print bed won't be printed. So by varying how much of the model of the Arm is above and below the bed will decide how long/tall the arm will be printed.
I am a fan of the SR-71 Black Bird and I am true believer in form follows function.
I also believe the best desing is one that just works and doesn't make you have to wresle with using it and you don't think about it all the time.