Drybox universal spool holder

This is another part of my ongoing process of designing a drybox that will hang on the side of my Airwolf HD2x printer. This thing will be useful for other folks too. I have a nearly completed set of drawings for a sealed Plexiglass box that will have a hinged door and a universal spool holder. So here is what I have for the spool holder. The idea is that it should be able to handle the 3 most common spool inner hole diameters: 0.78", 1.25", and 2.05". These holders do not turn. The smalle