The Bridge is an ultra-lightweight filament spool roller, it costs only a total of 84 grams of the filament with a super strong and durable body. (bridge cost 54 and roller barrel cost 30 grams)
It can easily adapt most spools in the market no matter how big or small your spool is.
Hardware:
Four 608 bearings(You can also print your own)
No screw is needed.