Pick one version of the upper, and one version of the lower. The lower portion has 2 versions, one with screw holes and the other one without. I used screw holes and double-sided tape as my wrapping paper is pretty heavy, but if you have roles that are not as dense, you could probably skip the screw mounts.
For the upper portions, it's just to keep them upright so you probably won't need to screw them in as they are not bearing much weight, but I included versions with screw holes in case you wanted them secure. I originally designed them so they are the same height as the lower section, but decided to shrink them to reduce the materials used. If you want to save even more material, feel free to shrink them as needed.
If you use screws to mount them, make sure the larger hole faces out, so the screw can pass through fully, and the smaller side should allow the screw to pass through and the head to hold it up. Most regular wood or drywall screws should work.
The author marked this model as their own original creation.