Spool Adapter for Filament Shelf

I love this Filament Shelf (thing 2253244) by asteinmark. As it happens, I put my shelf directly above my 3D printer, so I wanted a way to spool filament to the printer directly off of the shelf. I made this adapter that enables exactly that.

(Note to choose the correct version of the side rails STL to match whether your shelf is based on *asteinmark*'s version D or version C. Use **shelf_mountable_spool_holder_for_Version_C.stl** if you have Version C, otherwise use **shelf_mountable_spool_h