i have tried alot of the cheap china stuff. reprapper, etc. it all seems to have little issues or be inconsistant. it might be good one time and bad the next. high moisture or bubbles and air pockets in the filament. i recently had some rolls where the cheap saran wrap they use to wrap around the spools must have had some chemical in it because it degraded the abs and would break in your hand like dry spaghetti. there is a us manufacturer called village plastics. many companies sell their filament. they are prob the main usa manufacturer. the cheapest place i have found to order their plastic is through www.onlinefilament.com. it is some good stuff. this is the supplier to makergear and some other printer manufacturers.