Gridfinity Rolled Goods Holder

I needed a rolled goods holder, and most of the stuff available online was way too expensive, and way too big for what I needed. So I made this to drop right into my gridfinity setup at work. It's also the perfect size to print in only one plate on any full size Bambu Lab printer. I printed the holders in PETG with 3 walls and 15% gyroid infill. It's currently supporting a roll of film that's 10kg, plus a steel rod. I printed the core plugs out of PETG-CF, just for some abrasion resistance. Also with 3 walls, but with 25% 3D hexagon infill. My core plugs are not using any bearings. All you need is a rod, and two 6000 series roller bearings to make it work! You can probably get away without the bearings, if you have a smooth enough rod, or if you use a bearing in the core plug. The core plug is customizable, and can be customized to be used with any size bearing, or even without a bearing. In theory, you could design a printed rod to just connect between the core plug and th