My universal spool adapter design for Bambu AMS system to be able to use 250g spools.  I wanted a spool adapter that had a hollow center so I could still use a desiccant tube in the middle. I also didn't want a narrower spool adapter, as the ones I tried that were narrow rubbed on the AMS head causing a squeaking noise. 

I have tested this adapter with Amolen, sunlu, and OVV3D mini spools so far.  

I have included 2 print options, the first is 2 color like the ones I printed in the photos, and the second is a single color option.

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***Update 4/09/2025:After testing more filament brands I have found that some have a smaller center diameter than my spool adapter and will not fit, so I have made a new print profile with a smaller center diameter to fix this (Version 2.0) .  I reduced the outer center diameter from 53mm to 48mm. The center locking pin is also slightly smaller than the original version to fit the smaller center. All other dimensions are the same.  From some research I have found that the 250 gram spools that look like the one below are the ones with the smaller center diameter:

While the original version of my design works great with a good majority of the 250 gram spool brands, and I have printed 3 of my original spool design and regulary use them for most of the small filament spools I have, in the interest of making this adapter as truly universal as possible I decided to modify it into a V2.0 with the smaller center.

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My spool clip holder case

Key features:

*Spool clips to hold a mini spool to the adapter allowing the AMS to roll filament back when changing colors. there are 2 clip options: 1 for normal width mini spool edges, and 1 for thicker width mini spools.

*center locking pin that keeps spool adapter halves from coming apart. Designed so that the locking pin can be removed with needle nose pliers.

*indents on inner spool rim for holding filament end when not in use, eliminating the need for a filament clip.

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Please note: the only supports needed to print this are the ones “painted” on the file already. They support the clip indent on the spool and the top edge of the locking pin cutout.  Please make sure you have supports enabled and set to “manual” 

If you want to print this on a smooth plate like I did please adjust the settings as follows:

**Be aware that the smaller pieces, the clips and locking pin, will require a brim if printing on a smooth plate, here are the settings I used:

If you want to have the top surfaces be smooth please enable “ironing” under the Quality section.  These are the flow rate settings I have found to be ideal:

Happy Printing!