Better Buffer Space for Cereal Container Drybox

I printed a few of the cereal container dry boxes for my printer setup and was finding that when my MMU3 pushed filament back into the box everything worked pretty well and there was enough space for the filament and the upper corner brackets did a good job of keeping the filament inside the spool boundaries. Then I loaded a full spool. The first few filament changes kept having issues where the filament escaped - after watching for a bit I realized that the pressure of the filament was raising the flap enough that the filament could escape. This remix changes the shape of the flap of the corner bracket to have more space in the middle of the flap. This adds more space for the filament to go into thus reducing the pressure on the flap but also pushes the filament towards the middle so even if the flap moves a bit, the filament isn't at the edge and able to escape. I made several of the brackets since the amount of space available for the curve depends on the filament spools you are using (and, if you are using all the space in the box, there might not be enough space for any of these). The bigger the number in the filename, the bigger the curve offset. For my setup with spools that are ~200mm in diameter and ~65mm in width, I found that the front bracket worked with the 12mm variant and the back bracket worked with the 6mm variant. It is also possible that just the front bracket being changed would be enough. NOTE: I have done a moderate number of prints with these installed and things are going well so far but I will update here if something needs updating as I keep using them Update 9/9/25: Something that is obvious in hindsight but didn't occur to me when I made these is that this makes the flaps a bit stiffer which puts more force on the spool and has caused me a few issues when using a cardboard spool that was very close to empty. I'm probably going to consider how to mitigate this in an update but wanted folks to be aware.