Since this popped back up to the top, I looked at a lot of the edge cover designs and opted for this one (for Polymaker, and others):
It’s here:
https://www.printables.com/model/297018-cardboard-spool-rim-with-minimal-sides
Why I chose it -
- It’s much more minimal than a lot of other designs
- Prints in 14 mins & costs a huge $0.11 USD
- It’s keyed, so no slipping
- Fit my Polymaker reels perfectly 1st try
- He posted 7 versions so you can try which you prefer
- Is very low profile so it doesn’t have a “hits the AMS cover” problem
What’s not to like? 