Increased height to 70mm and added retaining edges on the other two posts. The original was a little too short for the Elegoo cardboard spool, this one seems to work well after some very light testing. Easy to slide on and off AMS Lite - a bit fragile with thin walls, but this is about as thick as you can make it while still fitting between the AMS mount and ≈55mm narrow spool hole. They only work in one direction, so you have to mount the spool on the same side of AMS as the adapter is orientated. Instead of pushing harder, try rotating while pushing if you are having trouble pressing all the way through.

You can either print one of these for each spool you have (getting the adapter on and off wears down the cardboard core and might break thin walls) or just use this one tool : 

Slim S.R.T. V2 (elegoo/esun cardboard spools)

https://makerworld.com/en/models/769327#profileId-704951

The adapter still makes it easier to slide on/off vs without, so I'm printing for each spool…if spools start falling off due to poor grip I might go back to using the Slim S.R.T tool…Assuming this adapter wouldn't work for any top or wall-mounted AMS - they might just slide off!