The Bambu Lab filament with spool has been sold out in most colors, so I ended up with a ton more refills than spools. I decided to print the exact reusable spool Bambu Lab provides, and it came out beautiful! However, it took 10 hours of printing and 210g of filament (~$4 cost). I do suggest buying them from Bambu Lab with filament (if they are in stock). Note: There definitely are other reusable spool STL files out there, which use less filament, but I wanted to use the exact one Bambu uses, s