Waste during the 3D printing process has long been a problem. An initiative spearheaded by Richard Horne (aka RichRap) kicked off a flurry of activity that culminated in most major filament manufacturers offering coils of filament without the spools. This video by Thomas Sanladerer is a good explainer.
3D printed master spool
The 3D printed master spool can be found on thingiverse, and can be printed in PLA or PETG.
Install coil onto master spool
See this video for a walkthrough of installation: