I would buy a more expensive printer before spending money on making your own filament. Market price of spools of filament isn't too bad at about 3-5cents a gram. You would still have to buy the pellets to extrude your own and take the time to make and reel it up. The raw materials are cheaper though, looks like about 1-2 cents a gram. Interesting, might have to look into making filament some time, however I would rather not have the additional ABS odor exposure.