To jazz up the spindles a little, you can use AMS Lite Universal Spindle Accents by Jeff Smith - MakerWorld or create your own!

Note: Any updates to the original instructions are noted at the bottom.

AMS Lite Spool Adapter

If you’re tired of dealing with inserts, this or that when trying to use your AMS Lite with various spools, then you and I have that in common.

I created this to solve this problem for me and am sharing it with the hope that it helps others. One of the requirements I had for this project was to NOT require any permanent change to the existing spindles, and to be able to use the existing springs if so desired. If an AMS Lite had to be sent back to Bambu for Warranty, it can easily be done.

I printed these in Sunlu PLA white, while actually using one of the universal spindle adapters.


 

This has gone through my own testing, printing, tuning, adjusting and I have several others doing the same. That said, we don’t have every roll of filament out there so you might be the lucky owner of that roll we didn’t test with. I’ve spent perhaps 30 hours and a spool or two of white filament testing and tuning.

Should you find a spool that doesn’t work somehow, your feedback would be greatly appreciated, and perhaps a picture/measurement or two as opposed to just slamming me via comment review.

There are many ways the adapters can be used on a spindle, sometimes you may need 1, or 2, plus the nut. I usually just put the extra on the spindle anyway, so I don’t have to worry about where to put it.

The replacement spindle is designed to be used with the existing springs.

****IMPORTANT**** PUTTING THE SPRINGS BACK IN IS WHAT POSITIVELY HOLDS THE SPINDLE IN PLACE. IF YOU USE THE VERSION WITHOUT THE SPRINGS, OR CHOOSE NOT TO PUT THE SPRINGS BACK IN, YOU MUST USE AT LEAST 1 OF THE SLOT PLUGS PER SPINDLE. THE PLUG OR SPRINGS IS WHAT POSITIVELY KEEPS THE SPINDLE FROM SLIDING OFF.

There are instructions on the Bambu Lab website on removing the springs (spool claw they call them) but I prefer to use a lever and push up through the hole on the inside of the spindle. The hole rotates with your finger to the appropriate spot.
 

My Video:

AMS lite AMS Spool Claw Installation Tutorial | Bambu Lab Wiki

The new spindle will slip over the existing spindle once the springs are removed from the original. Then you can choose to put the springs (spool claw) back on or not as mentioned.

Once ready, put the spindle assembly back in place on the AMS Lite paying attention to which is green, and which is yellow.

I’ve included a few pictures of various spools and how I assemble them. Honestly, it’s pretty versatile and can be done almost the same way every time and work just fine across multiple spools with only a handful needing a different orientation.

Couple of important notes: The .3MF file has tree support, support blockers around the threads as the threads should not need them based upon the size/angle. If you do, remove the support blockers. The only supports I used were primarily inside the universal spindle.

These are the print settings in the .3MF and the ones I use for the nut (also shown below in Update #1)

2/29/2024 Update #2:

1. Added a slight taper to the threads on the nut and the cylinder. Keep in mind the nut does not need to be tightened down to the last thread, it won't likely ever go on that far. If that still is too snug, see #1 in the list below.
    
2. Added V3 stamp to the models so that I can keep track of which is which, and answer questions/address concerns accordingly.

2/9/2024 Update #1:

1. If the nut is too tight, depending on your printer, filament, etc. (it's meant to be a little snug at first) you can increase the size slightly in Bambu Slicer. These are the NUT dimensions I use in Bambu Slicer with V3 (your results may vary). Once printed, I put the nut on and rapidly twist the nut back and forth on the first few threads a couple times, then move in a couple threads. The friction will smooth out the threads and the will spin like the video below.
   
   
   
    

1. If you are seeing too much stringing when printing with support blockers on the thread (I see them occasionally and just pull them off) and you would like to use supports on the threads instead, remove the large support blockers and replace them with something like this. Should allow the printer to easily bridge the open space (where the support blockers are) and then the supports will just pop off in pieces. Rough support contact may cause a snug fit so you would want to play with how the supports contact the threads. (again, I just prefer to not add the time for supports, or the hassle).
   
   Also recommend you print the threads at “silent” speed, on both the spindle (you can wait until the printer is at the threads on the spindle and change to silent to finish) and the nut.

Leaves a gap that allows the supports to be easily removed.

2/11/2024 Update:

My chief beta tester Diana wanted shorter spindles and less threads to decrease the width of the overall AMS Lite when this mod is in place. I removed a little over a half an inch in length from the spindles including thread. Note you can't use the springs with this model. There are still slots in the side but that's just to there isn't so much surface area to run/contact when you put the spindle over the stock spindle.

There are two smaller tapers as well. All tapers, nuts, and spacers work interchangeably so I recommend you print out a couple of this or that and figure out what works best for you.

Note: these new versions are called “V3 Diana Edition” as stamped on the parts. 

04/22/2024 Update:
Picture showing how the taper can be used to center 250g rolls of filament.