I was having an issue with cardboard spools on my A1 and A1 Mini making squeaking noises and sliding onto the spool arm. So I remixed the spool adapter below to fix the issue. I resized the diameter of the adapter to 54.5mm, so it fits snug inside of an overture spool without being forced in. I am working on testing the Elegoo adapter and will update if any changes are made. I also made the rims of the original spool holder much more narrow so they will fit nicely on the spool holder for the A1 Mini (see photos).
UPDATE: Elegoo spool adapter works perfect!