Shelf or spoolholder for printer rack, parametric

When I bought my H2D, I bought a rack on wheels to put it on. The rack barely fit it - specifically there was no room for the side spool mount. There were, however, square crossbars and so I decided to make a gadget that hooked to those square crossbars. My first version just had a bar that the spool spun on. But I also wanted a shelf that was big enough to put a non-Bambu filament dryer feeder that I already owned so that I could print TPU out of it. Parametrically, flangeiftrue = true; produces the spool holder, flangeiftrue = false; produces the shelf; I was worried about strength. So I added an extension to the backing plate, triangular gussets to help support the shelf, and side bars so that I could be sure to not have fore-and-aft fallout from the shelf. The large shelf takes a printer with the vertical volume of the H2D to print at all. It is pretty big. The smaller shelf can be printed in a printer with 350mm vertical space. gusset=true; causes those features to be generated, w