Polymaker Cardboard Spool Adapter (Minimal Versions)

Polymaker has a well-design spool adapter for systems like the Bambu AMS, though I'd generally prefer an adapter that prints faster and uses less filament. These models remix the Polymaker model for the same precision fit but can print faster without much change to the useability. 

Ring Only - This model removes the Polymaker logo from the middle. For most spools, the rings will still fit tight and additional tabs were added to help keep the ring on. This reduces the filament used to just 7g and print time on the Bambu X1 is about 15 minutes at 0.12 layer height.

Reduced Sides - This model removes some of the side material on the ring since this is mostly just stylistic. This reduces only about 5g of material (putting it in at about 21g) and takes about 15 minutes off the printing time from the original.