I like the concept and the simple design. The screw on end cap is also a plus since it should work with a variety of smaller spools other than the Sunlu 250g that I'm currently testing it with. my only issue is it seems the weight of the spool is pulling it away from the AMS, ever so slightly. I worry that if I don't check it regularly, it may fall off eventually.
would smaller dimensions fix this? how small is too small? I want to print 3 more, but would like to see if we can find a solution. Also the filament seems to grind against the side of the spool and it's pulling into the AMS. I'm not sure if anything can be done about this.
Looking forward to hearing your thoughts.
Thought: could you make this cone portion flatter? so the spool is closer to the AMS overall? I think that would help with the weight distribution and limit some of the drag.
Not sure if this will work with your setup, but I made a filament guide that helps to compensate for the drag caused by the spool being off-center. = https://makerworld.com/en/models/488560