I had to buy some spooless filament from Microcenter out of necessity, but spools that fit and worked in the AMS were lacking.
I liked this original spool the best because the chamfered edges were removed, so the edges have more surface area contact with the AMS rollers. My only change was to add little spikes around the spool holder to grip the cardboard roll.
I found that when the roll was getting towards the end, the cardboard tube would loosely spin around the spool and always error when retracting. This should prevent that, although initially you do have to use a little force to get the roll on the spool.
Again, I haven't tested this much, but so far it's been ok. Hopefully it helps someone out. Figured the spikes would be better than just increasing the diameter to allow for small variations in size. I've only tried on Inland rolls, but it may work on eSun spooless filaments as well.
The author remixed this model.