Hello! This is an adapter I made to fit onto the Amazon basics shelves (can be found here) by taking the measurements from the shelf and a spool rack I had been using. With this, you can use all the space available and give yourself even more places to store filament!

I printed this in black PLA with no issues. 0.24 layer height, 10% infill, 2 walls, gyroid. 

MATERIALS TO BUY:

1" diameter PVC pipe (cut to 36"/3' in the case of this shelf)

8x 3M heat inserts

8x 3M 25mm screws

HOW TO ASSEMBLE PART:

1. Look at the pieces printed, specifically at the little block at sticks out. You should see four small holes. If the holes go all the way through, that is a TOP piece. If they do not, that is a BOTTOM piece.
2. Take your BOTTOM piece and install a 3M heat insert into each hole.
3. Assemble the TOP piece and the BOTTOM piece together, ensuring the four smaller holes line up. They should both fit together like a puzzle.
4. From the top of the TOP piece, insert a 3M 25mm screw into each hole. Then, tighten them all down until the two pieces are connected. Viola!
5. Repeat steps 1 through 4 to complete the other rack.

HOW TO PUT ON SHELF:

1. Take eight of the small insert pieces that came with the shelf (for my shelf, they were labeled on the inside with an “E”). While these are used to hold the shelves in place, we'll be instead using them to hold our filament racks in place!
2. Put the inserts wherever you want on the shelf.
3. Take both of the racks you made, put them through the legs of your shelf, and press them down onto the inserts. Make sure they're on tight.
4. Take your cut PVC pipe, and insert it into one of the PVC holes. Push it through until you're able to get enough clearance to pull it back into the PVC hole on the opposite side.
5. Great job! You're done!

This is one of my first projects I've made while teaching myself Fusion 360. If you have any issues, be sure to let me know so I can update this and make it better!