

I just found this on AliExpress: $11.25 | Mellow LLL Filament Buffer For 3D Printers - Automatic Filament Feeding, Break Detection, Improve Print Quality For Voron Vzbot https://a.aliexpress.com/_mtdTiwv
Literally use one just like this to feed filament to the extruder - has feed and retract buttons and can also double as a filament runout switch as well
Well, kinda- gerrymandering itself was illegal until the current Supreme Court (well, the GOP part) decided to gut election laws for Trump