Im sewing bamboo fleece & velour nappies. There is alot of fluff, so I have tried to blow it out. When I test on a scrap of brushed cotton its working fine, and then I try the naps again and it f*@#s up!! Grrrr. I have wondered as you said about the pressure and speed, since it seems to run fine on my the scraps.

I will rethread and do all those others things you suggested and see how it goes, thanks for replying so quick its so fustrating when sewing goes bad!!!

I`ll be back to add more to this thread later if its still not working after I try all that stuff.