I have been getting excellent results and strong parts with filament from 51buyusa on ebay. The sticker on the side of the spools says "reprapper". It is only 27.99 a spool. I bought 5 rolls from "digitude" on ebay and it was crap, I fought about it and finally got my money back, but it wasn't worth the hassle. I also buy from "sidewinder inc" on ebay for about $20 a roll but he only carries black and white. The brand name on that filament is "Folgers Ind" and gives good results. Hope this helps.