Uh, that would be deceiving marketing, a 1kg spool should contain 1kg of filament...
But hey, maybe my view on this is a bit warped because I only buy filament from reputable brands (and usually from their own store) and not from marketplaces like "big A" where hundreds of sellers battle to be the cheapest.
NiyaShy
joined 1 year ago
If companies that still used plastic spools are starting to switch to cardboard, I think that's a good thing. Not only is it easier to recycle, but probably also lighter (your typical 1kg filament spool weighs around 200-300g), so the bulk should save some fuel for transportation.
Though I personally prefer using no spool at all (during shipping) 😉 Wherever possible I buy Masterspool refills.
PETG has become the second "entry level" filament besides PLA because it's almost as easy to print with (just hotter) and also doesn't require an enclosure. Not as stiff as PLA and has a little flex, so perfect for prints that don't have to be 100% rigid. For example I printed a smartphone holder for my bike out of PETG with 4 "arms" that grip the corners, and it has just enough flex so I can get the phone in and out. Temperature resistance is only a bit higher than PLA.
TPU/TPE are flexibles and available in all grades of flex, the softer ones can be tough to print on bowden machines.
The "kings" of temperature resistance and toughness are ABS, ASA, PC (blend) and PA ("nylon"), but they pretty much require an enclosure and good ventilation (fumes...) and have to be printed very hot, so an all-metal hotend is highly recommended.