Spool silica barrels adapter

My two AMS consistently retain 10% moisture, thanks to all the silica gel I’ve put inside. It is also inside the 50 mm barrels designed for the filament spools by Jorge Rui and other guys -> https://makerworld.com/en/u/3059492201. Having already printed enough of them for all my rolls, when I started using spools with a diameter of 72/75 mm (given the ratio between price and quality I use, among other, PETG by Sunlu and TPU by Greetech) I had 2 possibilities: either print others barrels of that size (for example those that have been loaded by Tecknikfussel -> https://makerworld.com/en/u/824974429), or create an adapter from 50 to 72 mm. I chose the second option and the design inFusion 360 was quite complicated, I absolutely wanted to keep the maximum passage of air towards the desiccant and the result is what you’ll see. Actually I didn't think I could get a nice print from this object because of the many horizontal parts, without some support and in PETG (since I have started using t