Spool holder without screws

I saw most of the spool holder needs me to buy screws. But that's really hard for me to buy some. so I design this.

You will need two bearing to the holder it. The inside diameter of the bearing is 8mm and the outside is 12mm. the height should be 4mm. You can simply place it on the center rod of the holder and fixed it with any method you like. I use a lighter

The spool holder should be able to hold most of the spools on the market. I will share the f3d file out instead of writing too much here. There are a lot of problems with my design. like the friction is too less so the filament can go messy. you can improve that by increasing the friction of the bearing(DON'T DAMAGE IT)