I decided to make a version of my own. There are thrust bearings to help with friction from lateral forces as the filament pulls side to side on the spool during unwinding. I made a reverse thread nut that pairs with the axle that will remain threaded as the roller turns so it doesn't unscrew over time. If the spool stops rolling than it is too tight and you need to turn it right to loosen it up every now and then.

NOTE:

You will notice the frame mount part extends beyond the frame after the radius. At first I didn't like this but it grew on me and it actually does serve a purpose. Since the machine vibrates a lot during printing, the tighter the fit on that face, the more vibration that roller shaft is going to feel. The more distance there is from the face, the greater the amplitude of the frequency thus the lower number of cycles and fatigue the cantilevered member will see during it's lifetime. Eventually it will fail, it's plastic. Hopefully this significantly extends that lifetime.

I did borrow some purchased parts from another spool holder I found to try and save you a couple bucks in case you have printed that version too. Like I said, I did add some thrust bearings so you will have to order those. I think the assembly is pretty straight forward from the pictures but it goes like this. There is the axle (key looking thing). You slide the thrust bearing on (it's a needle roller sandwiched between two washers), then slide the normal bearing on. Then the roller goes on and overlaps that pair and envelops the axle. The next normal bearing goes on followed by the second thrust bearing. Finally, the spacer goes on, lastly the reversed thread nut goes on to tie the whole roller assembly together. You take that and slide it into the keyed slot of the base, then slide the flagpole into the same keyed slot right next to it. You should mount that base to the printer frame first to make things easier on yourself.

I uploaded the print profiles. Printed at 0.12 since these are slightly higher tolerance parts. You might be able to get away with 0.2, I didn't try it. Go for it if you want.

Please rate and upload your pictures, I'm trying to get some points to score some gift cards and get another printer. If there is anything wrong with the print give me a chance to bump the revision and fix it, I'd like to know about it!

Hope you like it and have fun putting it together. It was a fun project.

Parts not available in BAMBU store:

https://a.co/d/8dJFA4Y

https://a.co/d/gsHnDAz

https://a.co/d/axFcQlw