Unfortunately as aardvark says not all nylons (or any other material ) filaments are the same. Earlier this year when we decided to set up a small 3d printing facility for our Science Consultancy we tried a wide range of Nylon Filaments some as cheap as £15 per Kilo up to some £64 per kilo. Of those we tested with our simple machine we could only get good prints with 3 off those we tried Taulman Nylon 230 Taulman Bridge and Spectrum Filaments PA6 Low Warp. The £15 filament !! when we could get to stick on the base plate split between layers under its own internal stresses before it completed a print. The 3 filaments above print reliably every time.you get what you pay for!!